The thing is, Andrew, that mains + phone line + TV aerial seem to being routed from an unbuilt house to an unbuilt shed all through a very small diameter tube in order to do the main broadband and TV installation in the shed. With a wired feed back to the house to provide internet access and internet TV back in the house. With the position of the master socket unspecified at the moment, but the shed being indicated. (We apparently have a concrete-walled shed with insulation of some kind).
Itís a complete mess. Not helped by the OP not always explaining things very clearly, but seeming adamant that the best internet service is required in the shed.
... the shed needs to have the most durable internet connection.
The simple cable to the shed may be the answer. although chnelling it cleanly may be an issue, whats the situation with length? ie - when will my signal start to degrade due to cable length?
He specifically seems to rule out a Cat5 cable earlier. Yet power plus Cat5, with the latter carrying an unfiltered feed from a master socket in the house seems easiest. Better for the VDSL2 may perhaps be separate feeds on the Cat5 for ethernet from the router and phone from the filtered backplate. Thus shortening the VDSL2 distance from the cabinet, but making messy wiring in the house and probably not worth the effort.
Where the TV aerial comes into it is puzzling, given that presumably an aerial feed in the house is also required. Yes, aerial splitters exist but are not ideal, and internet TV is also being used.
There just doesnít seem to be a coherent plan. I think Ripley has a valid question.
A one-hour on-site visit by any one of several here would probably arrive at a perfectly viable solution. Just leaving the installation to be done, preferably by Openreach. Which the CP would need to arrange. In itself, not always guaranteed to happen.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. 200GB. Sync 74565/13753Kbps @ 600m. BQMs - IPv4