Glow worm 30ci combi boiler pressure too high

Hey there folks - quick question if anyone can help.

Our boiler pressure was sitting at 0.4 last night after bleeding the radiators. After releasing the blue tap underneath to help increase the pressure, I tightened it as the pressure reached 1.2

However, it has since risen to 2.9 and there is a rattling noise coming from the pipes as water gushes out of the overflow pipe.

What should (or can) I do to reduce the pressure? I've tried bleeding the radiators again to no avail and have no idea what else to do.

Any help would be greatly appreciated.

Scoop

the filler ain't closed properly by the sound of it

or you have snapped the crappy plastic thing off

Where can I find the filler? Is that the blue tap I mentioned?

As you can tell, technical jargon isn't my thing!

Where can I find the filler? Is that the blue tap I mentioned?

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yes