Thorp Arch Trading Estate occupies major part of a former Royal Ordnance Factory, (ROF) ROF Thorpe Arch, in the City of Leeds metropolitan borough, West Yorkshire, England close to Wetherby. The trading estate is now divided into industrial and retail space. There is still much evidence of its former use around the site. It is similar in style and layout to former ROF Aycliffe in Darlington, County Durham.
George Moore (founder of Moores Furniture Group) bought the site near Wetherby in 1960s, converting it into a trading estate.
A major development on the estate (and certainly the biggest employer) is the British Library lending division. This is the British Library's second site, the St Pancras site in Central London is the main site. The British Library Boston Spa, as it is known, is is housed in a large eight story concrete building (with windows set in narrow slits to avoid light damage to the books) and many smaller, with newer buildings set around it.
Moores Furniture Group furniture factory is situated on the estate, as is a Leeds City Council household recycling centre and a sewerage works. There are many other small businesses situated on the estate.
The Thorp Arch Retail Park is perhaps the most notable part for local people. It is set in semi-underground bunkers and many of the retailers have grassy banks up the exterior walls. The retail park houses Brooks Discount Retailers, DFS (formerly Northern Upholstery), Empire Direct (formerly Miller Brothers), The Sofa Centre, The Greenery Garden Centre, a car showroom and a cafe.
The retail park once had a branch of Texas Homecare, however due to the small size of these units, it was necessary to set the shop across two units set several hundred yards apart. This did not keep in with the clean cut, purpose built style of the new Texas branches, and so they were closed; and the Texas Homecare chain no longer exists. The retail park also formerly housed Bargain Street (a now defunct West Yorkshire discount clothes and household good retailer).
In the 1990s there was a plan to turn the adjacent village of Walton West Yorksire into a New Town, although this never got off the ground, green field areas around the site have been developed into residential areas. It seems likely with the high demand for houses in Leeds, especially in the Wetherby and Boston Spa area that there will be many more residential developments to come in this area in the future.