The Dewhirsts factory shop closed down around 2013 after numerous name changes to Impression and finally AJ’s Outlet.
(I think they actually stopped manufacturing clothes there in the late 1990s)
As of late 2015 the site is being cleared
Dewhirsts Demolition, Dormanstown
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This will be the site of the Redcar Gymnastics club when they relocate next month. As far as I am aware they are using part of the old building which was still standing.