Where can you find the police or repo auctions in the UK?

I would like to know the times or dates and if I need a membership to go to auctions, as well as being carried out.

Police Car auctions: Every month, literally, thousands of government-owned vehicles was taken through foreclosure laws. Because of the large number of vehicles in the possession of government must be settled quickly and cheaper to reduce storage costs. Only the top rated police car auctions offer the largest selection. This allows you to choose virtually any brand or model to 90% off retail value. Http: / / www.policeauctions.info/

British Car Auctions sale – Aladdin’s Cave of convertibles