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The filler loop system is the same on all boilers I've ever seen.
Somewhere underneath where all the pipes come out there will be a silvery flexy hose connecting two of the copper pipes. This hose will have a black valve lever on it. Turn valve, watch water pressure rise on dial on boiler, turn off when at 2 BAR.
I am not a plumber, this is just how I've fixed 'low pressure' before.
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The next challenge is to work out how to top it up given my boiler conveniently doesn't have any model no. on it and half of it is behind that cupboard.
From a google image search it looks like a Vallaint 242 Turbomax.
http://www.vaillantservice.co.uk/VAILLANT/Vaillant_Boiler_Self_Help.html
Backstop
Greenbank
@aggi
Having googled this it looks like that is a distinct possibility, cheers. The next challenge is to work out how to top it up given my boiler conveniently doesn't have any model no. on it and half of it is behind that cupboard.