Innovative PVCu extrusions
and creator of the Liniar brand


Trade extrusion company HL Plastics Limited was started by Godfrey Harris and Stuart Leese in a 10,000 ft factory at Riddings in Derbyshire in December 1974. Since then, the company has been through several transformations to reach its current status as one of the Amber Valley’s largest employers. Here are some key milestones in the company’s history.

1977: The factory is moved to new purpose-built 17,000 sq ft premises in Little Eaton, Derbyshire.

1981: HL’s first own-brand product range is launched – Suregrip Duckboard System for roof walkways.

1988: A management buyout is led by Roger Hartshorn and Mike Bosworth.

1989: Tarpey Harris Precision Toolmakers is purchased to gain access to the latest toolmaking technology and enable future development.

1990: Second own-brand product range is launched – a range of cellular foam building products to supply the growing base of window customers.

1991: HL creates the Eurocell brand to launch its building product range.

1993: A range of PVCu plastic piling is launched, using recycled plastic and in-house injection moulding is developed.  HL’s plastic piling range was launched in 1993.

HL's plastic piling range was launched in 1993

1994: HL designs and launches its third new product range – the Eurocell Ultimate 70mm Window System. First trade centre is opened in Dorset.

1995: The Eurocell warehouse and distribution is relocated to Cotes Park, Alfreton – a 63,000 sq ft facility.

1997: A new factory is built in Alfreton to enable Eurocell to manufacture its own products.  HL Plastics remains at Little Eaton.

1998: Tessenderlo Group acquires a 75% stake of the group.

1999: HL develops the verandah and decking system. Eurocell develops its inline sliding patio door.

HL's decking system was launched in 1999, later to become the first Liniar product

HL’s decking system was launched in 1999, later to become the first Liniar product

2001: HL develops Suredeck Safety Platform. Eurocell develops a conservatory roof system – Pinnacle – and the co-extruded Logik 70mm system.

2003: Tessenderlo Group acquires total ownership of the group.

2005: Roger Hartshorn and Mike Bosworth form a new company, Flamstead Holdings, to buy back HL Plastics and Tarpey Harris from Tessenderlo Group. Tarpey Harris starts up a wax injection department.

2006: Construction begins on the new factory site for HL Plastics and Tarpey Harris in Denby, the former site of Denby Hall Colliery. The Liniar brand name is launched, initially for the decking system.

The Denby Hall Colliery in 1880

The Denby Hall Colliery in 1880

2007: All companies relocate to the new factories in Denby. The Liniar fencing and gravel board system is launched.

2008: The brand new Liniar window chamfered system is launched – the first system ever to incorporate strength and energy efficiency in one window profile.

The Liniar window system was introduced in 2008

The Liniar window system was introduced in 2008

2009: The Liniar sculptured system is launched, in addition to a new Liniar verandah hand rail system and recycled deck profile.

2010: The Liniar bi-fold door system is launched, the first PVCu bespoke bi-fold of its kind. The Liniar EnergyPlus range is also launched, with even higher thermal performance.

The Liniar bi-fold was the first of its kind

The Liniar bi-fold was the first of its kind

2011: The Zoom Liniar conservatory roof system is launched. Tarpey Harris launches a specific tool maintenance department.

2012: HL builds a new 60,000 sq ft warehouse next to main HL Plastics production plant to keep all products on one site. The Liniar inline sliding patio door with patented ModLok security is launched.

2013: HL opens new lamination plant a few miles away together with a new 60,000 tonne capacity mixing plant on same site. Liniar Log Pile is launched, providing a hard engineering retention solution with a soft engineering appearance. Liniar’s brand identity is refreshed.

The state-of-the-art mixing plant opened in 2013

The state-of-the-art mixing plant opened in 2013

2014: Flamstead Holdings buys Wegoma Machinery Sales. A new generation of bi-folding doors is launched with the Liniar ModLok bi-fold. Liniar Zoom roof kits are launched in matching colours. The Liniar Flush Sash window system is introduced for traditional dwellings. Prime Minister David Cameron visits the factory. HL Plastics celebrates its 40th birthday and wins awards including Derby Telegraph Company of the Year and Growing Business of the Year for mid-sized companies.

Liniar Zoom roofs were launched in kit format in 2014

Liniar Zoom roofs were launched in kit format in 2014

2015: The Flamstead Holdings Group, including HL Plastics, Vintage Windows and Avantek Machinery is purchased by Quanex Building Products, with Hartshorn remaining as Group CEO as part of the deal. A range of PVCu foam window trims is launched, together with Liniar Approved installation supplies including cleaners, silicones and adhesives.

2016: The Alumina bi-folding door is launched, as well as a new range of PVCu foam fascia boards and soffits. Work commences on a new 178,000 sq ft warehouse to allow for further growth including new employment opportunities.

2017:  The exceptionally energy efficient EnergyPlus90 profile is launched.

A 9 chamber systems, EP90 achieves PassivHaus standards and passes WHO criteria for urban noise.

The 178,000ft² Liniar House is opened and the company’s foiling facility is relocated to Denby from Alfreton.

The company’s patented, cutting-edge ModLok™ bi-folding doors win the prestigious Queen’s Award for Innovation. Martin Thurley joins the Flamstead Group as Group Managing Director ushering in a new era.

2018: Ideal for commercial and high rise applications, the Reversible window is launched into the market.

The Elevate lantern roof is launched at the very end of 2018 with slim sightlines and exceptional energy efficiency.

The company far surpasses standards set out by the Environment Agency to achieve ISO14001 accreditation for Environmental Management.

2019: The revolutionary Resurgence flush sash window is brought to market as the first UK PVCu double-rebated flush sash window with unrivalled energy efficiency and authenticity. Elevate Squared, a modernised square version of the traditional Elevate roof is launched into the market.

The Liniar decking range celebrates 20 years in operation and launches a range of hardwearing composite decking.

The company receives a record-breaking number of award nominations, finalist positions and wins; including a finalist position for the G Award for Sustainability Initiative of the Year, National Fenestration Awards Product of the Year for Resurgence, Aluminium Company for Alumina, and several more.