I'm not sure how anyone can 'prove' their intentions-that's nonsense.
Reagan got credit for Immigration Reform 1986, indeed provided 'legalization' of illegals. The law was gutted on employer sanctions for future hiring of illegals, paving the way for where we are today.
http://www.npr.org/templates/story/s...ryId=128303672
As for Thatcher, enough of her decisions for increasing government power via the trade unions has already been pointed out as a progressive act. Only Drummond disagrees, but that may seriously be due to differences between 'conservatives' in US and UK. It seems to be, as Drummond has repeatedly made his case of being on the side of increasing government power, as long as he deems it for 'conservative' reasons.