Many thanks Guys for the Aden info .....
The "Boss" did 12 months down there towards the end of the UK's interest in that part of the world ..... I rem he used to send 10 duty free cigs to my mother a couple of times a week with his letters home ...... one day a letter arrived with lots of tape and a demand from the Postie for a couple of quid's Duty (HMG's Customs and Excise, $$$ bless them) ...... she simply wrote "Return to Sender" !!! ..... and off the letter went back to Aden ...