Thanks everyone! I'm new to this forum and thought I'd get emails if anyone replied, so had assumed inbox silence meant no responses. Delighted to see I was wrong
I found a PDF developer guide on one of the links here and it says Duct56 for copper and fibre, but I wasn't 100% sure it meant both in the same duct so thanks for clarifying, MrSaffron!
WWWombat, I've tried New Sites at Openreach and even got as far as sending them an application form last week, but they rejected it when they realised it wasn't a new BUILD and we live in the property that's being developed. I have in no uncertain terms been redirected to make a consumer broadband subscription order in order to trigger the process for a BT site survey. Hence last Fri I signed up with PlusNet who tell me Openreach with be out on 18th Feb, 2 days before the council require the trenches are filled in!
thanks nonetheless for the suggestion.
yarwell, that link looks GREAT - thank you. As zarjaz says, it looks like I'm on my own time-wise, so underground prep is where it's at. I think this link along with the confirmation from MrS gives me what I need (duct and rope) to have the underground bit sorted. As long as nothing goes wrong with the pull cord, all should be well.
Having said that, we'll have to see whether they're willing to lay fibre alongside copper in an area where we don't yet have a fibre option. I hope so!
If anyone thinks 50mm duct and a draw-rope is insufficient, please let me know ASAP, but otherwise I shall toddle off and purchase lots of each.