Relax... you have found a reliable electrician in London. Impedance Electrical Ltd is a friendly and reliable company based in London who consider no job as too big or too small. Qualified, professional electricians with years of experience in the industry.
"Replacing a plug-in Bosch oven onto an existing cooker circuit. I need a 13A FCU fitted in place of the existing flex outlet plate, plus a Minor Electrical Installation Works Certificate. Small job."