Missed all the replies as was away sorry.
Thanks for the advice, but in the end have decided to go for the Apple TV 4K. Looking at the price comparisons for the actual films was the clincher for me. They are cheaper from what I have seen so far and also it saves on cluttering my house up with discs.
Tried it out last night (not on OLED but a normal 4K) and all looked good. Only issue that I found was that panning scenes and sometimes in standard scenes it was very juddery. From a quick bit of research seems it was down to the resolution of the Apple box. I did have it set at 4K 60 Hz and had enabled the option for it to change resolution to match the source, but it did not seem to do that. Went into settings, changed it to 4K 24 and all was good.
Will also be able to use this as the hub for my home automation too, so has a fair few plus points for me.
Again, thanks all for the time taken to offer advice and views