Originally Posted by
jamesreid978
I think rapid refers to the lateral flow tests, which are not accepted. PCR tests, no matter how quickly (rapidly) the results are returned should be accepted. The marketing lingo of using rapid to signify a quick return of results of a PCR test is potentially what is confusing things.
You hit the nail on the head. Many of the (more shabby) testing providers use the term 'rapid PCR' to advertise a 'low cost option' and they provide a rapid antigen/ lateral flow actually. Don't want to know how many people have to rush for an actual Rapid PCR at Heathrow as their certificates are not accepted at check in because of this.
If OP uses the Collinson/ Randox or Express test (where the company is called 'Express test', just to avoid confusion

) Rapid PCR all should be fine, as others said.