Awesome thank you all. It sounds like I should probably get a device with 2 x DVB-T/T2 terrestrial tuners and a FBC Satellite tuner. That way I wouldn't have to worry about watching/recording at the same time.
Maybe I should consider just using Kodi for distributing channels to other smart devices then, as I wouldn't have to worry about fooling plex with complicated setups etc. Thanks for the heads up on this.
With a device such as the GiGaBlue UHD Quad 4K, with the Twin tuner DVB-C/ T2 module - would I need to physically split the signal from the aerial to both inputs, or can one input tune both multiplexes at the same time for viewing/recording?
Also I saw a mention that the Gigablue device can only do 'Multi-stream' when using the add-on satellite tuners, and not the built in ones. I will have to use the DVB-C/ T2 tuner add-on module, so I am not sure if not being able to 'Multi-stream' satellite channels will affect anything in terms of viewing/recording on both the box and on Kodi devices?
The VU+ Duo 4K SE looks like an amazing device, but with the tuners included it's approx. 120 pounds more expensive that the Gigablue model
I had been leaning towards the Zgemma H7S, but with the single DVB-C/ T2 tuner I feel like I would regret not going either the VU+ or Gigablue route.