It depends on the uniqueness of the device.
Currently there's no direct equivalent from Sony for your EX603. The stand-out feature of that 2010-year TV was the 4 HDMI sockets. It's hard to find that on 32" TVs any more because they're so rarely used as main lounge TVs. 32" has been relegated to the kitchen/bedroom/kids room so there isn't such a strong requirement for the expense of a lot of connectivity.
The closest in a new Sony is the KDL32WD751 at £320. Depending where you buy you can get that with a 5 or 6 year warranty. That's your bench mark.
In the past Ebay has been littered with people selling LCD panels for all sorts of TVs. So far though, a little light searching hasn't thrown up anything for your EX603. That either means that new supplies are being restricted to authorised repair agents only, or they've run out. Either way, unless you drop on something incredibly lucky, you're probably going to struggle to get this fixed with a couple of simple mouse clicks to order a part. Your option then is to open the back and search online from any of the part codes you find on the panel. It may be that it's not a Sony but another make, so searching by the part number might turn up some cross reference that gives you LG, Chi Mei, AU Optronics or some other brand.
If you're comfortable doing a DIY repair and can get the panel for under £150 then personally I'd say it's work it. Those 32" TVs for under £250 are, for the most part, made by 3rd party suppliers who simply stick a name badge on to their generic design. Be careful too buying anything with Saorview. It's okay if the TV is pan-European and designed to work in the UK as well as the Republic of Ireland, but living in Staffs as you do you wouldn't want to get stuck with something that doesn't understand the UK transmitter network.
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