I think most time served guys have done a cash job at some time,its a matter of pricing that has you cornered,
do a proper job, in your time, with your costs(fuel,materials,tools etc) and simply knock 30-40%(maybe even 50% if you really like the girl!) off what your boss would charge,
customer gets it for nearly half price, same guy actually does the work,
but make it crystal clear, the job is guaranteed until I get to the pub with your cash.
and although you are undercutting proper trades, at least the customer knows he is getting a proper spark, but NOT the comeback or guarantee of a firm.
anyone here that can tell me they have never done a foreigner please own up as to whether you are time served or not.