The IoW place was at High Down, near the Needles and was used for testing SARO's Black Knight / Black Arrow rockets, not Blue Streak. Some of the Blue Streak buildings are still used at Spadeadam by the EW Range (one of the engine test stand blockhouses was used as a store for all of the spares for the Russian kit they use up there), though the Blue Streak test stands at Greymare were in a bad condition when I was based there in the late 90s.
As for Bloodhound Mk 1 sites, the one in best condition is the ex 94 Sqn site at Misson, which defended Finningley. It is owned by a military surplus vehicle dealer, who operates the place under the name of 'The Rocket Site'. On one of the missile pads there the owners actually has a rusting Bloodhound Mk1 on a Launcher. The site at Woolfox on the A1 was in good nick, though somebody burnt down the Explosive Fitting Building in the last few years. Most of the buildings are gutted hulks and are used of storage or other purposes (the one remaining LCP building at Woodhall Spa is now the clubhouse of the RAF Conningsby Golf Club).