Now now, you should all know better. I'll have to paraphrase, as I don't have the reference to hand (Rule 17, if memory serves), but the requirement exists to 'conform with pattern of traffic or keep clear of the aerodrome', along with the requirement to make all turns to the left, unless ground signals say otherwise (Rule 35, perhaps?).. .. .Straight-in approaches are for big aeroplanes, circuits for little ones. Overhead joins are safer for lots of good reasons.. .. .Bluebeard, using the overhead of a very busy aerodrome as a navex TP is very poor, as it contributes to the contents of the 'honeypot' where the mid-air will take place.. .. .Lawyerboy, if you need to save money by flying for four minutes less, you shouldn't be airborne.. .. .Finally, the remarks about joining angry palm trees at low level hit the mark. This makes for a safer environment for the reasons stated.