Hey!! Im so jealous i leave 3 months today
Your best cards to take with you are a nationwide cash card or debit card - since you havent got a nationwide card youll only be given a cash card to start with this is fine, you get free cashwithdrawls - thats all you can do with the cash card though - so no use for booking hostels/flights.
Get yourself a Caxton Global Traveller card - good exchange rate, easy to top up via online/phone/sms, and you use it just like a debit card. dont put all your cash on it though incase you lose it always have a back up card with you.
try take a credit card too for emergencies the best ones nationwide cc, post office cc or the zantander zero card.
£3K should be about enough depends where you are and what you want to do roughly to live comfortable on the east coast your looking at £1K o £1,250K
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