thanks for the replies i think i have averted the problems for now as it looks like it was the thermostat housing (split along bolt hole) that was causing the leak. The hose will be the next thing to go as i have replaced all others + housing (twice). i will keep an eye on ebay for a new/newer replacement. learned again how much of a rip off dealers are. VW wanted £8.20 for a thermostat housing gasket. I got the whole housing + gasket for £10.50 online. they also wanted £3.70 each for the housing bolts which i got for nothing at a fixings company, bloke said it wasn't worth firing up the computer for 3 bolts.