We booked to go to Grenada in November on a whim. Had a vague idea that a main course would be around £8-10. Now it turns out, the hotel menu on their website was from 2018 and didn't include 10% VAT and 10% service charge...
Having looked at other places, nice (but not amazing by European city standards) seems to be about £40 a main course... and basic local restaurants about £15 (More expensive than Brixton!)