We're just about on the right side of spam at the moment, so keep it sensible(ish), folks. 
My personal advice would be to put it towards a deposit on a
house, not a flat. Flats rarely increase in value compared to houses i.e. even if you sell the flat for a slight profit later on, you won't make as much as if you bought a house. Of course, both can decline vastly in price as everyone's found out when this particular bubble burst. A ?30k deposit is 20% of a ?150k house, and you can get something pretty decent in most areas for that if you don't mind driving to work. Remember:
all investment is gambling, and you can lose absolutely everything if you bet on the wrong thing, but if you buy a house to live in, you at least have somewhere to live (provided you can afford the mortgage, and current rates are vastly below the long-term average i.e. you need to be able to afford 7% rather than the 4-5% currently advertised).
Plus, if you're not really in a position lifestyle-wise to be looking to buy a house yet, then just put the money into a high-interest bank account. You might earn a little bit of interest (not much these days) to increase the value even more. If I were you I wouldn't bet on the stock market. Much smarter people than you have lost every penny doing so. I actually know someone who inherited enough to buy a house for cash, and invest the rest. They lost everything
except the house when the stock markets crashed, but at least they had a roof over their head. Only ever bet what you can afford to lose.
Do
not spend more than ?1000 total on frivolous stuff (like games or holidays) - honestly, I can not emphasise enough how much you would regret doing that.
Of course, it goes without saying that you should pay off any debts in the first instance.
Also, my condolences on the loss of your aunt. Even if you didn't know her well, it's still a bereavement and those things are usually at least slightly sad.