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Many people here use this travel agency and I used it last month. David is a P sufferer himself and people from all over the world, not just UK, use his agency.
I only had two weeks. It has helped enormously but the P is beginning to come back just where I lost it within a month. 3 or more weeks would have been ideal for me with 30-35% coverage. I do not believe 1 week would be that helpful, if I am brutally honest :-/ Also, the sun is quite hot out there in july and august and you wouldn't be able to spend as much time as possible out in it as those who go in april and may or end of september/october do. I managed 6 hours a day for 12 days in early july, but I have the skin of a rhino and can handle 50 degree heat!
However, you have to do what you can to cope...and if you feel one week is better than none at all, go for it! But don't expect anywhere neat the results you could get if staying 2/3/4 weeks. I think the fact that my P has returned in the places that were smooth and white after 2 weeks (and I worked very hard to get that!) just shows that you do need those extra weeks to really clear yourself AND get a remission worth spending 1000s on.
SJ