Living in the UK is expensive compared to many places in the World. The cost of living will of course depend on the individual situation (and tastes!) of each individual, but you still need to be prepared financially. Just because you’ve been working hard to save many thousands of your own currency, doesn’t mean it will be quite as many pounds!

As I am working as an estate agent in Plaza Estate firm so I can give you brief idea about cost of rental flat in London : http://www.plazaestates.co.uk/properties-to-rent

Flat-Share Rental per month East London £290 - £390 (single)
West London £280 - £430 (single)
South London £280 - £500 (single)
North London £300 -£400 (single)

UK cost of Food & Drink

Average pub meal £6 - £10
Average restaurant meal £12 - £20
Pint of beer £2.50 - £3
Average bottle of wine £10
Average meal for two in mid-priced restaurant £40

UK cost of Transportation
Weekly Zone 1-6 Travelcard £41
Monthly Zone 1-2 Travelcard £86
Train trip to Edinburgh £110 (standard single)
Train trip to Cambridge / Brighton £17 - £20 (single)
Avg mid-sized car rental for a weekend £70
Return budget flight to Spain £120 - £150 (budget carrier)
Eurostar return ticket to Paris £125 (standard class)
Return flight to Ireland £50 - £60 (budget carrier)