Many thanks for your quick reply. It had not occurred to me that the flex pipes could be considered as a semi-permeable membrane but if that's the way ir goes so be it. I take your point about not short cutting brake servicing, but will wait to see if I can get a good deal on a VW Tiguan which I have booked a test drive in when the local dealer gets one. I think at the low mileage I'm probably in a low risk area at present.
Thanks again.
jfS
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