Our boiler pressure has gone to high, HELP? Is it really dangerous?

ok normal boiler pressure between 1 , 2.5 our boiler. drops below 1 quite morning, mum tried increase , stupidly left little valve thingy increases pressure on long , rose 2. now, whenever turn boiler on, moves between 2.5 , 3 bar.

essentially, want know is, how dangerous this? we'll call out tomorrow in meantime, our boiler going explode or something? safe enough use tonight , tomorrow morning?

make clear, i've looked draining points don't know how bleed radiator , don't think have radiator bleeding key. i've looked pressure release valve don't have clue or looks like, plus don't have proper diy stuff fixing it.

so, in meantime, safe put heating on?

ok normal boiler pressure between 1 , 2.5 our boiler. drops below 1 quite morning, mum tried increase , stupidly left little valve thingy increases pressure on long , rose 2. now, whenever turn boiler on, moves between 2.5 , 3...

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