I think there is a 2-year expiry on the B1 - at least that's what i was told yesterday by Trinity School itself. The test result itself doesn't expire, but the UK gov. won't accept it older than 2 years.
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Tom, can i ask a probably dumb question but one i've not seen asked before - when calculating the 30-months residency to get to the first date we can apply for the FLR(M), what is the status of any holiday periods taken outside the UK during that first 2.5 years in the UK ? This seems a bit important to me. We had just one 3-week trip to Thailand, so is that not part of the 30-months or definitely included ? Thanks.