I guess it all depends on what you want to do and the type of lifestyle you want to live to.
The amount i quoted would be for a backpacker, who has had to budget for months before and maybe for months ahead, therefore not living a lavish lifestyle but getting to see many of the affordable tourist hotspots and staying in relatively cheap accommodation etc.
If you are there for a holiday or a short-travelling experience and have no real need to budget, then hell take as much as you want and blow it on a fantastic 5 weeks.
But all in all, £1000-£1500 should be ample for SE Asia.
Have a good one.
I answered a very similar question for an American tourist a week or so ago, I have "cut & pasted" it for you, you just need to convert my estimates into GB£.
"Are you travelling alone (ie the $4,000 is just for your own costs) ?. If you are then I would suggest that in Thailand if you were to travel around the country, then you should budget on:
based upon reasonable quality B&B's, low grade hotels & homestays, you will be able to save a little money by living in a tent on occasions, but this is pretty much as cheap as it gets.
this is based upon 3x meals a day, basic stuff (not all noodles !) + either water, or the luxury of an occasional coke !. Typically would be either Pad Thai, Spicy Pork Salad, Fried Rice, BBQ Chicken & Sticky Rice or similar.
based upon you moving location approximately once a week, with local travel only being taken on Songthaews(red/yellow pick-ups with canopies & bench-seats) these are the very cheapest method of getting around, mixed in with lots of walking !!. Travelling between the destinations would be by cheapest bus or trains (where possible). Visa runs are NOT included, you would need to ensure you are near relevant border to do as cheaply as possible.
If you intend to visit Thailand for longer than 60 days, then you need to get a "Tourist Visa" which will allow 60 days, then you can do a couple of "visa runs" which would give you a further 15days each, so 90 days is relatively easy to achieve.
If you were in Laos, Vietnam & Cambodia the overall costs would be very similar, as there economies are on a par with that of Thailand, with the exception of the beach areas, which will be cheaper in the other countries as their tourism trade is not as developed as that in Thailand !!.
SO based upon all of the above, I would suggest that your $4,000 budget would stretch as long as 6 months + a little further by saving additionally wherever you can.
Through the original thread, it was generally considered to be an accurate reflectionof the likely costs, so hopefully this should answer your initial question accurately.
You don't actually need to take any money with you at all since you can withdraw funds as you need them via the numerous ATMs to be found wherever you go. I'd even go so far as to recommend you only take say £50 with you in actual currency to be used only in emergencies. Just make sure you have an adequate bank balance to cover any transactions you make. All ATMs in Thailand have instructions in English and you'll have no problem using any of them. Also, the exchange rate using ATMs is much better than for banknotes.
But avoid using a credit card unless you've no other alternative. If you do need to, make sure the transaction is completed in front of you. If you lose sight of the card, you risk having it passed through a skimmer after which you're account will probably be raided.
Thanks for the replys guys!
Kevin you always offer ace advice thankyou for that list!