1

This TA link lists 715 hotels in Bangkok area. Shouldn't take you too long to find your particular hotel.

http://www.tripadvisor.com/Hotels-g293916-Bangkok-Hotels.html

Good luck.

2

or use the correct term for bangkok........Krung Thep. as most people have never been to bangkok noi or yai, since on the other side river.

but 25 a night very doable.............

3

Try booking.com, limit search to price range 0-39 pounds, 529 hotels in this category, sort on price and other criteria to limit the number of hotels somewhat.
Using your brain might help also.

4

#4 Bit hard there! Been a member for 6 years and goes to India. First time to Thailand.

OP google Honey Hotel, 1,000 baht a night with pool and breakfast.

5

Check out New Siam II. Clean, in-room electronic safe, pool. Right near Rambuttri and 10 minute walk from Khao San road. About 800 baht per night. 16 pounds.

6

For someone who has traveled so much you should already know that you can find many hotels in Thailand, even with air conditioning starting from as low as 10 - 12 pounds. Of course you can find a hotel even in Bangkok around 25 pounds or even less. This is around 1200 baht. There are many old posts with hotels even cheaper than this - with A/C too!

Nana Ibis. Close to Skytrain route, easy walk to malls, nightlife, restaurants, etc.
http://www.bangkok.com/ibis-nana/

Orchid Group Hotels. (Small places without fancy lobbies, here and there in Nana area, some not far from above Ibis.)
http://www.staywithorchid.com/

Swiss Park, Maxim's Inn, Bangkok Inn, President Inn, Business Inn, Suk 11 Hostel, Soi 1 Guest House and many others in the same Sukhumvit Nana area. Many other places you can discover by walking around.

http://www.urbanrail.net/as/bang/bangkok.htm