That's really useful - thanks!
I had a hunt around - I see the interbank rate for GBP to Colones is about 763. The best I can get at a bureau de change in London is 713(!!!) so that's a 6.5% loading.
With my bank, I'm going to take a 4.75% hit via an ATM - so long as the ATM itself doesn't add anything else on! Are there standard issue bank ATMs at the airport?
That line about tipping - at better grade hotel restaurants, can you add the gratuity to the bill, or is cash preferred there too?
Thanks
Tony