I think you'll find the shed at WU is for the whole of No 1 AIDU (where's No2 then?)
AERAD have been under contract to print MOD TAP's for about 5 years now; the RAF made a big thing about it when it started; since then AERAD have changed hands several times - Raytheon - Thales - and now European Aeronautical Group (Euronautical), but as far as I know they still do it. I have at my unit for instance, a set for a certain RAF airfield dated 19 Jan 06 with the words 'No 1 AIDU (RAF)/European Aeronautical Group Aerad' in the margin.