most people buy plans about 3 months in advance. The stats are in the thread that Mulberry posted for you but I believe the number mentioned for custom plans is not reliable and I think you guys should use the numbers of success for the whole site, abotu 65-75% depending on how strict a sway and how many tactics are used.
Yes I do plans for people in the UK all the time. I don't rely on particular brands of stuff really, there are always replacements you can find.