The webpage for Tesco Travel Money is here:

http://www.tescofinance.com/personal/finance/finance/travelmoney/index.jsp

I followed the links to this page and it says at the bottom that "Tesco Travel Money is provided by Travelex Currency Services Limited, whose registered office is 65 Kingsway, London, WC2B 6TD."

So the Peterborough address probably belongs to Travelex. A search of the database for returns one verified entry which is for Travelex's online helpdesk and is 01733 457357. This is a Peterborough number, so I think we are getting warm. They may even be able to deal with your enquiry on this number.

Other 01733 45735x numbers answer as other Travelex helplines. Going upwards (01733 457xxx) we have:

360 Saga Travel Money
378 A1 Travel Money
379 Asda Travel Money
380 Boots Travel Money
381 Bridge Travel Money
383 Creation Travel Money
384 Thomson Travel Money Services (redirects to 0870 241 3268)
385 Co-op Travel Money Services
387 Euro de Change in association with Travelex
388 Barclays Travel Money Services
389 Holiday Extras in association with Travelex
390 Holiday Extras Travel Money in association with Travelex
392 Barclays Travel Money Services (redirects to 0870 241 5137)
393 Barclays Travel Money Services (redirects to 0870 241 5137)
394 Tesco Personal Finance Travel Money Services
395 Holiday Extras in association with Travelex
396 Royal Bank of Scotland Travel Money Services
397 Netflights Travel Money Services in Association with Travelex
398 Travelscope in association with Travelex
399 UK Currency Exchange in association with Travelex


Bingo!  

I have added an entry to the database for Tesco Personal Finance Travel Money Services which is 01733 457394, which is the same as calling 0845 600 6667 and selecting option 1.