story, I've just spoken to a mate that's high up in the
Master Locksmiths Association, they have been lobbying the government to regulate the sector for some years, so I would always look to use a MLA member myself - too late in this case, but worth everyone remembering for the future.
As soon as I mentioned what you had been charged & that you are in London, he said straight off "you're are going to tell me it's 'My London Locksmiths' aren't you?", apparently they are well known to the MLA as rip-off merchants, and are used as their main example of why the sector needs to be regulated when lobbying government.
He said in London, just out of hours, he would expect a MLA member to charge double the daytime call-out charge, so £75x2 = £150, which would cover the time on the job too, plus the cost of the lock, somewhere between £25-£50 absolute maximum, so total £200 + Vat = £240.
He begs you to complain to Trading Standards, the MLA want as many people as possible to complain about dodgy locksmiths, as it will help the MLA lobbying efforts.
He agreed with me that it's possible a demand for a 50% refund under threat of County Court action is probably the only option open to you, the threat itself could work, if not, personally I would gamble the £35 charge to issue a CC summon via
Money Claim Online - IME, out of 6 summons I've issued over the years none were contested, 5 were pay straight away or when default judgement was made.
The other was totally ignored, but as it was over £600 I could escalate it to the High Court, so I had High Court Enforcement Officers clamp his company car until he paid up, cheeky fucker called me a few months later wanting me to do more work for him, my reply involved two words, and the second one was 'off'.