I see Chickenjohn. Yeah the average garage rate per hour wouldn't get you far into £300 but I suppose they have their overheads and need to cover them. Also most MOT style garages would do a right crap job to just get the work to pass a MOT so you would be back to where you started within a couple of years.
It would take me longer than 2 days to do it but then again I'm not doing it all the time like you are.
It would take me longer than 2 days to do it but then again I'm not doing it all the time like you are.