As much as I know here in UK the time is changed to summer time earlier then in the rest of the world, I might be wrong though.
About figuring out all the little detail, for me this system is about getting things in order and getting things right. I fully understand that different brokers will have slightly different charts, which will affect the system, but I'm happy with this, because I can't access any interbank feed, so I'll use what I can. The thing is, the system has sound basis like 1:2 risk reward ratio, exact entry and exit rules, and a filter (21 SMA) and it works with the trend. So based on this I like this system, the broker I use is the broker and feed I can access, that's it. No need to worry about the little detail.