We are presumably talking about Bournemouth. If so could be various reasons, radar (ie provided by a separate ATCO) probably not provided but ATC still provided by a single ATCO in the tower providing Aerodrome and Approach control. Don’t confuse this with non ATC Air/Ground service. As for a circling approach, if inbound from the east (?) flew 26 approach to break cloud then visual circuit to land 08 if the tailwind on 26 above limits? Probably saving a few minutes flying time over flying a full 08 instrument approach procedure from overhead.