You should get it with a DA platform, which has the exchange messages streaming in.
They give you the FTSE opening call and range (normally 50 points, but not always). It normally is at about 07.45. Wherever it opens it will always go and touch the opening call, normally sooner rather than later.
In my three years at this, it must have traded outside that range on about ten days. If it gets to the outer boundary, it's a pretty safe trade. It also, every day, will falter and maybe reverse at the 20 and 30 points from the opening call.
I was out all day today so didn't have my platform on. I'll post it tomorrow, just the once for your info. (If you look back at my posts in 2002, I think, I used to post it every morning on Bonsai's thread. But in the end people didn't find it useful.)