1st Contact
Offers visitors to the UK help with tax refunds, money transfers, bank accounts, etc.
http://www.1stcontact.co.uk/

All in London.co.uk
Bureaux de change listings.
http://www.allinlondon.co.uk/directory/1062.php

Barclaycard OnePulse
A credit card, Oyster card and cashless payment card all rolled into one.
http://www.barclaycard-onepulse.co.uk/

Chequepoint
Chequepoint operate a number of bureaux de change in London.
http://www.chequepoint.com/

Freedom Tax Refunds
UK income tax refund specialist.
http://www.freedomtaxrefunds.com/

Global Refund
Tax free shopping service.
http://www.globalrefund.co.uk/

Rapid Refunds
Tax refund specialist.
http://www.rapidrefunds.co.uk/

Tax Back
Are you owed a UK tax rebate?
http://www.taxback.co.uk/

TNT Forex.com
Transfer money quickly, securely and cheaply between the UK, Australia, New Zealand and South Africa.
https://secure.tntforex.com/

Touch London.co.uk
Index of money changers in London.
http://www.touchlondon.co.uk/business/search/
typeId/253/type/Bureaux+De+Change

Travelex
Find the nearest Travelex foreign exchange to you.
http://www.travelex.co.uk/

Visit Britain
Covers the British monetary system, credit cards, tipping etiquette, banks and more.
http://www.visitbritain.com/in/fact_files/planning/money.htm

Visit London
Search for banks, bureaux de change and ATMs in London using this online tool.
http://www.visitlondon.com/planning_your_visit/essential_information.php