I noticed a fair bit of discussion re "flaps up or not?" and it reminded me of a day spent taking pictures of the nice aeroplanes arriving at Heathrow. This was in April last year (5th April in fact). An approaching United 767 aborted his approach a mile or so to the east and went around. It was intriguing to watch as it did the whole grand tour around circuit with his flaps and gear down. Because of the nice gentle speed and relatively low altitude, it was possible to watch its progress around half the circuit and the wheels were never retracted.
This contrasted with the many go arounds I have seen at Heathrow when the wheels are usually retracted while the aircraft is still climbing out on the runway heading.