Bike Mate Shackle Bike Lock (D-Lock) Reduced from £4.99 to £2.49. Found this in my local Aldi store in Wolverhampton (stafford rd) I am not sure if it is nationwide or not. Considering £4.99 could not be beaten half this is a absolute steal in my opinion. The lock comes with a bike frame attachment and 2 keys.
I heard chatter of these locks being easy to pick but after many failed attempts I gave up sure that it is at least scum bag crim safe.