I actually had 5000 5 x 1000 tabs and 50 Testoviron, 1000 Stromba and 5 x 10 Viromone with a signed disclaimer saying they were for personal use. I stated I was taking 100 Anabol a day and 3 amps a day. At one stage I was on 30 Anabol a day anyway...
I had 4 packages stopped out of 11 in a 6 month period, never had any lost, stolen e.t.c.
I believe customs are not too bothered about personal users, I have also been stopped at Turkish Customs coming home from Holiday with 500 Sustanon and 2000 Anapolon in my suitcase. They laughed and sent me on my way after seeing what they were.... not sure UK customs would have taken the same approach though.... lol.