The school itself probably can't offer these exams - but if there's a tame UK FE/GR/RT Examiner out there with all the appropriate kit for the RT practical exam, he/she could probably set up as his/her own RF to conduct all these exams and tests? The school would no doubt come to a suitable arrangement to facilitate such testing.
But having heard tales about non-invigilated PPL exams being marked by the receptionist at a certain school, anything is possible....
