Not necessarily - flight to Banjul (?) would put the A320 at MTOW or near as damnit. If there was a medical emergency or MX
issue the crew cannot dump fuel and she wouldnt be at safe landing weight yet on reaching Bristol, so they either land overweight (which would put the frame out of action for a few weeks while they do surveys etc) they probably circled to burn off as much fuel as possible to get down to a safe landing weight - obviously if the medical problem was a stroke or a heart attack then they'd eat it and land immediately, (full emergency, inc fire services for a possible brake fire etc) but if the problem was something MX
-related or a medical emergency not bad enough to divert immediately but bad enough to warrant the aircraft holding while they assess the patient, then they would circle to burn fuel to land at a safe weight so that once they've bussed a new crew in (am assuming they didnt have a spare crew on board to fly the return leg?) they can be on their way after filing new flight plan etc.
What do you mean you dont have any bourbon? Do you know how far it is to Houston? What kind of airline is this???