Re: 156 aircon mystery - help!
It does sound like a leak to me. When Kwik Fit topped it up did they put PAG oil in the system as well? Only this gets circulated by the gas and lubricates the compressor.
The compressor could be sticking under normal use but your jumping the wires may have given it additional amps to get it to work.
Could also be the low pressure switch is faulty or its connection.
Because these systems are so complicated, I would recomend getting a speciallist to look at it. A full aircon service and system check normally costs around £100. Kwik Fit wouldn't be able to fix any faults.