I once went to Southampton to clear outbound to Alderney. The children were sleeping in the back. They made us wake them up and take them through the terminal only to have to turn round and go through Xray, security customs etc. to get back airside. As there were no flights leaving at that time they had to start all the equipment to screen us.
Ridiculous, as we had only stoppped to clear outbound and the immigration/customs man had come out to the aircraft anyway.
Never went there again.