said a/c stopped for fuel as it was getting a bit short, as enroute from LAX there was a medical emergency for which they turned back to LAX but enroute back the medical emergency was resolved and they turn around again heading for LHR, then enroute it was clear there was not enough fuel to get to LHR, the crew elected to go to GLA but as there is no support there MAN was the preferred option. Put on some fuel and then left an hour later for LHR.