Idea Tab Pro TB373FU

That's what I use-- the Lenovo ideaTab pro 12.7 is very readable, but it can get a little heavy to hold sometimes. You have to de-crap-ify some of the Lenovo software but otherwise it's a solid choice and a good value at around $400 USD-- hopefully about 300 pounds in the UK for the OP.

I use the lenovo IdeaTab pro matte Edition. Very nice to read on but one downside is the battery drain even when unused. The pen is nothing special and needs direct charging viable cable. If those are not a major issues for you, great value for money.

Bro wth how are you getting 5m/s decoding latency,I own lenovo idea tab pro/moto pad 60 pro which has dimensity 8300 I am getting 7-9 m/s decoding latency at 2560×1600p