Unfortunately I won't have any photos until the next time I am up there.
I think it is almost certainly the cabling but probably more than just the connector. I had a spare F connector and followed a guide to fit it. Unfortunately the wire was too thick to simply push it on but I could have used tape to keep it in place. I didn't bother as pushing the cable to keep it in place with my hand still gave no signal.
I gave up in the end and am getting a sat installer out on Monday to fix.
The terrestrial signal is marginal too (can fail based on the weather) so I'll get them to fix that too.
I will report back on the final cause.

You dont push it on as it has threads on the inside which should screw on , yes we will have to wait then.
RG58 cable

Yes, it probably wasn't the right F plug for the cable. It wasn't big enough to fit over the outer sheath and even attempt to screw on.
The cable is probably about 40 years old so I may see if the SAT installer can replace it and maybe add a second for redundancy to avoid future problems.
https://www.wrightsaerials.co.uk/articles/coax-cable-quality.shtml
https://www.webro.com/tv-satellite/wf65-twin/
There must be a ham in the house?
Long time SWL and scanner fanNowadays, feeder of ADSB data to t'internet.

Its all changed since Heuvos was a boy - bloody zello operators wouldn't know how to use a callsign never mind tell a dit from a dah.
https://morsecode.world/international/translator.html
- .... . ... . / -.. .- -.-- ... / .- .-.. .-.. / -.-- --- ..- / -. . . -.. / .. ... / .- / - . -..- - / -- . ... ... .- --. . / .- -. -.. / .- / - . -..- - / - --- / -- --- .-. ... . / -.-. --- -.. . / - .-. .- -. ... .-.. .- - --- .-.
Code:https://morsecode.world/international/translator.html
If its 40 years old it's probably not even a 100% screened cable and it has possibly degraded a lot. It may also explain why the original F plug fell off. Ideally digital from either an aerial or satellite dish requires a better quality cable with 100% screening. A lack of proper screening in a down-lead can result in localised electrical interference getting into the cable and causing picture breakup.
The cable you have is very likely to be the type "D" mentioned in the following article. Note the article is probably 20+ years old and so prices are well out of date.
Code:https://www.wrightsaerials.co.uk/articles/coax-cable-quality.shtml
A satellite installer is more likely to install a twin WF65 cable these days
probably the WF65 twin (al screen) rather than the more expensive Cu (copper) screen variant. While this does work for the majority of satellite installations if you have a marginal signal from your aerial it will be unsuitable for the aerial down-lead as it has too much attenuation and much more than the thicker CT100, WF100, RG6 type cable.Code:https://www.webro.com/tv-satellite/wf65-twin/