If you are in London, then sightseeing would be the best way to make your time more worth and valuable.
Foreigners are allowed to buy apartments, condominiums and freehold land, however, there is a 100% Land Tax for foreigners imposed on the property value, this will double the cost of the land for foreigners.
Be it Business trips or holiday trips, a wise man always plans ahead to avoid any sort of travel disruption. The main reason that you need to plan ahead is that there too many things involved with a travel plan and of course you can have a travel agent book everything for you might be wealthy enough to pay him a fortune, but if you are the average economy class traveller you need to do a lot of Googling to find your perfect travel solution.
Finding the best place to park your car in an airport and travel long distance is a big nightmare especially if you are travelling from London airports such as Heathrow and Gatwick.