Background preamble to the main question: Vacuum cleaner started playing up - intermittent stopping of motor over several months, followed by final death. Since this is a cleaner with a motorised head, and the intermittent nature of the problem had been related to waggling of the hose, a non-expert diagnosis would say that it was likely a contact problem in the hose somewhere. Looking inside the cleaner itself seemed to confirm this - no signs of a burnout anywhere. Took the cleaner to the local dealer, who sent it to their contractor. Answer came back "its the circuit board in the cleaner thats gone". Because everything inside the cleaner seemed fine, and because of the above-mentioned intermittent nature of the problem, it seemed unlikely that it was the circuit board - in my experience, PCBs either work or they don't. I expressed my doubts about their diagnosis, but they were adamant. After they quoted an enormous amount of money to fix the cleaner, I decided to take it back and fix it myself. I contacted the manufacturer and obtained a new PCB (c.Â£70). I fitted the PCB and still nothing worked. At this point I discovered a way to complete the hose circuit without the hose being attached. The cleaner fired into life. Hence my initial diagnosis had been correct. I then re-fitted the original PCB and the cleaner again worked just fine. O.k. Â£70 out of pocket, because the manufacturer will not take back a part that has been fitted - fair cop there. The main issue: When I had removed the old PCB, I noticed that one of the major components had been deliberately crushed by someone - presumably in the repair shop - using a pair of side-cutters (the marks were clearly visible on the shattered item). The PCB was still working despite this damage. I've had that cleaner since new, and it has never been opened up for repair before. Hence it seems likely that the repair shop simply sabotaged the PCB either to elicit an expensive repair fee, or because they couldn't be fnucked to locate the actual problem. I'm now being Mr Angry Customer with a view to at least recouping my Â£70. Although "the repair shop deliberately damaged my PCB" might not be provable in fact, I'd actually be happy to put the circumstantial evidence in front of a Fast Track magistrate for an opinion. I now need a few threats to put into my claim letter, so would be interested to know what technical legal issues might be invoked: Question: If the repair shop had indeed done this damage deliberately, what trading or other offence(s) would they have committed? - attempting to obtain goods (i.e. service fees) by deception? - criminal damage? - trading offence related to making electrical goods unsafe?