where in London will you be based for work? If you let me know I can point you in the right direction. Mortgage -wise you are probably better off going to a broker but also check out the Sunday Times money section each week for mortgage deals.
I have live here for almost 10 years so I know the city quite well.
There are no obvious legal problems with buying over here, though since you will only have been employed for 6 months when you plan to buy, some lenders may be reluctant to pass you too much cash.
PM me for names of agents, websites and advice on various localities.