Advise needed TV size

[Midlife Crisis]

I have a viewing distance of just under 3m or 9 1/2 feet, I have looked at many charts on the web and it falls into the55/65 inch margin mainly 1080 content but also normal Freeview tv sd channels. I have looked in my local purple shirt shop [not getting it from there] and its hard to judge in a shop.
Any help deciding would be appreciated.
Also what this section of the forum needs is a hot deals section if the powers that be allow, good idea or not?

 

[Midlife Crisis]

unfortunately the only retailer left alive local to me is the purples, then there is a richer sounds a few miles away.
the sofa position is straight on, 65 would be the max I would go. May well book an appointment at richers net week.
I notice the 55 q90t samsung is available as I type this for £1100 at another online store