Worked started Wednesday 16th May, two days late. We were informed this now necessitated weekend work as the work top survey was booked for the following Monday. The fitter phoned the electrician from site Wednesday AM & informed him the job was starting, the electrician was too busy to attend that week. The fitter spoke to him about B&Q's policy for the electrician to first and second fit. Work commenced and the fitter under took all first and second fit electrics of sockets and under unit lighting with the exception of the cooker circuits which were later connected at the consumer unit by the electrician. I was aware this was not best practice. We had pre arranged guests at the weekend end and were out all day Saturday. When we returned my partner turned on the kitchen light which did not work. She tried the second (two way switch) and got a mild electric shock. We spoke to the fitter immediately, he said it could not be him because if he had drilled a cable the RCD would have tripped ! Did he know the RCD was operational or covered all circuits ? We were left to investigate the fault ourselves. I was unable to find the problem, I sort help from a neighbour and my brother by phone , a qualified. electrician. We had been promised by our fitter the electrician would visit Wednesday or Thursday of the following week, I made safe the live switch and chased B&Q Tuesday or Wednesday to confirm the electricians appointment. After a few calls to B&Q our fitter phoned me, he was clearly quite annoyed I had phoned B&Q and was rude and quite aggressive. I was angered by his call and phoned B&Q to complain. The electrician was now booked for Friday after noon, after some time they found a wall unit mounting had indeed been screwed through the light cable causing the switch to become live. The problem was resolved, the cooker connected & the installation tested and certified. The complaint was dealt with poorly from beginning to "end"