With 5 nominally 77kg pax, their baggage and 200 gallons or so of fuel the AC would have been on the heavy side leaving Luton. With roughly 100 (mostly over water) miles still to go and poor weather, they may well have reconsidered (especially if vfr) and decided to land somewhere, refuel and/ or wait for better conditions. As someone mentioned earlier weather is very likely to have played some part in this - but as always - we don't know yet - the actual causes not always the most statistically likely ones
Last edited by birmingham; 30th Mar 2017 at 15:15.