I'm with you BOAC on this one. Once again the purpose of a visual ATC-wise is to place an aircraft onto position, preferably on final, from which the pilot will be able it to complete the valid INSTRUMENT procedure completely or partially by visual means. Once reported visual with the RWY and reasonable grounds exist that safe landing can be accomplished ATCO is simply relieved of responsibility to provide adequate obstacle clearance not the IFR traffic separation though. Flying to any controlled aerodrome there'll be a valid IFR procedure in place let it be PAR SRA. It will be on the ATIS therefore there'll always be a valid IFR procedure. In your example most probably it'll be PAR or SAR approach for 09 therefore there'll be a valid IFR procedure for 09 with it's associated missed approach procedure. Look at it this way you're at the minima, say 400 ft, and you have acquired visual reference and decide to continue so you're visual now aren't you? At 200 ft you've lost it so what you do? You gonna fly a MA for this approach. Same story if you were at 1500 ft and reported visual. Reporting visual doesn't cancel IFR procedure it only shift the responsibility for adequate obstacle clearance from ATCO to the pilot. I've encountered it both were ATC instructed to follow published and RV missed. In reality not a big drama.
Cheers
