First, if its only intended to be used for your computer, don't get a TV.
Monitors have lower input lag, faster response times and higher refresh rates. To be honest though, unless you're playing some fast paced FPS games, you won't notice much of a difference. Some TVs however don't like being connected to a PC and vice versa, with the resolution usually being a pain to set up and sometimes looking slightly blurry or distorted.
Plus, you don't get the advantage of freesync. Freesync is a feature available on some monitors which makes your monitor refresh at the same rate as your graphics card. This provides a more "smooth" feel and games will look more "3D-ish" and it will feel as if your computer is running faster. There's also Gsync which is the "premium" version of freesync but most experts agree that the difference is minimal and not worth the extra cost.
Make sure the monitor is "Full HD" as that will provide
at least 1080p of quality compared to "HD Ready" which maxes out at 720p
Size is also an issue. I know you said up to 30 inch but I've found with particularly large monitors, it's more than a little annoying since you can't focus on the whole screen at once. Best range would be between 23-27 inch.
Ideally, the monitor should also have a "Display Port". This is different to a HDMI or VGA port as its designed specifically for PC and provides higher refresh rates at higher resolutions.
Here's one that I've found and is actually £60 below your budget and is energy efficient as well. It has both Gsync and Freesync along with one HDMI port and one DisplayPort. It's also 144Hz which is actually superior to 4K when it comes to monitors.
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