Valiant combo pressure keeps rising

Cheers. I'm panicking now. Do I have to change both valves? If I just change the one at the cold side I can isolate and then not have to drain the system? I guess there is a reason to have both valves though..

I've looked on line and there is a service valve that looks exactly the same as an isolation valve (for the cold mains side), then it looks like I need a service cock for the ch flow side? Does this sound right?

https://www.plumbarena.co.uk/produc...gclid=CMD36JfH-coCFQjmwgodgH8BeQ#.VsGn0mfFapo
http://www.clickonbathrooms.co.uk/0020010291-vaillant-service-cock-c2x11981204
 
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