Thomas Cook Travellers Cheques Review

I purchased travellers cheques from Thomas Cook in US $ during the purchase and general chat between myself, my wife and the cashier I was assured that Thomas Cook would buy any left over on our return (we at this time assumed the same rate at which we purchased $1.54 to £1) we returned with $1200.A couple of months later we booked a holiday to main land Europe we decided to attend at the same branch in possesion of our cheques and reciept cash them in and repurchase Euro,s. What a con they offered us the rate of $1.80 to £1 meaning we would lose almost £150 the cashier stated they do not offer a same exchange facility but a 0% commission .Needless to say we did not cash them in but purchased Euros after a visit to bank so be warned ask before you purchase if they buy them back at the same rate.We intend to use the cheques next year when we visit the States.