Aha ! Thanks guys, the info I needed. There are just so many drop down controls in that thing its a cryptic mess to play with.
I've also now moved the mirror up about 10mm and built another lightweight guide scope from a 50mm Bino objective and a few other bits. Still need to make an adjustable mount for the guider but plenty of time, the clouds haven't gone away.
I'll test DSLR focussing tonight I hope and with a wee bit of luck the weather might be kind towards the weekend.
If you make stuff instead of buying stuff do the clouds still know ...