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Personally I would say some who is competent is someone who has done the ACS and has the relevant qualifications but some of the folk doing it now dont give a fuck which is pretty insane, but you'll struggle to get someone else to sign off on your work as they then take the risk if something goes wrong.
jellybaby
Airhead
konastab01
Keep an eye on that though. I had pressure issues at one point and went about solving them this way but the issue was the expansion chamber which had failed, eventually the over pressure valve blew and they often don't seal properly after they've blown.
I'm probably breaking some rules by pointing out that you can test an expansion chamber even if it's integrated in the combi. Sometimes people replace them as it's a plumbing job that doesn't involve gas. Not sure that's allowed though. Integrated ones vary but mine cost approx £130 a couple of years ago.