The op was looking for changing sterling to baht. Your TT calculation are irrelevant to him. And he does not have to change large sums to get a dealer rate
Also I have not given any misinformation. I qouted the rate for sterling to baht cash as shown on the internet
Do you think savvy airline staff would go to banks rather than a dealer booth and why do you think there are always queues
With the greatest respect you just don't understand how dealers and their customers operate
TT and spreads are not relevant if only selling and buying cash