Ok you have 2 options with your charger.
You can power it through the DC Jack or the cables with banana connectors.
The DC Jack is limited to 7A and the cables 10A.
So in order to use charger to it’s full potential you need a minimum of 13.5v 11A+ PSU.
You can use any voltage between 10 & 18VDC but it will only reach 200w output when you have minimum of 13.5v.
Don’t get confused with input voltage and nominal voltage of your lipos. The charger has a buck/boost converter and will regulate the voltage to whatever programme it’s set on.
Turnigy make this Reaktor power supply
It’s more than powerfull enough for your charger and plugs straight in.
It’s an American plug but looks like it uses a standard kettle lead which I’m sure you have lying around.
Only thing is it’s not in the UK but I’ve used hobby king a few times and they own Turnigy. No issues and usually comes in a decent time.
If you need one quicker you’d be looking at a 200w laptop power supply but be limited to 7A through DC Jack.
Other than that some form of industrial PSU between 13.5 and 18V and around 12 Amps+. That’s probably going to be the more expensive option though.
As far as using computer PSU, it’s not ideal as only 12V so the charger will not reach the 200w it’s capable of.
Let me know what you think. If you want something quicker I’ll dig some more and see what I can find.