Morris Minor Owners Club

Over hear the best I have tried is Plus Gas, Have to see if the one you mention is available over here.

If something like a bolt is seized solid then try tying a rag round it & soaking with Coke, supermarkets own will do!
The Acid in the coke breaks the seal & the bolts will come out as easy as anything. You have to keep it wet though & leave it for a few hours...
Trust me.... it works!!