Can anyone recommend a laptop stand/tray that I can use in bed and will stop laptop overheating?

You'll want to buy a laptop fan/pad thing. You set your laptop on them and typically plug them into one of your laptop's USB ports. It should prevent the laptop from overheating. I'm from the US, therefore I'm not exactly convinced how much they'd cost within the KINGDOM, but I'm pretty sure I got mine for twenty dollars. It not only keeps my laptop from overheating, but since it lifts the laptop (because the laptop's sitting lying on the fan) and angles it a bit, it's been a lot easier on my wrists. I'd check circa on the internet or in stores for 1. It'll put away a lot of artillery power, just it's completely worth it (and who unplugs their laptop for regular use anyway?).