Mike,
I intend to do exactly the same on my 401 for the same reason you have said, I can't understand why Bristol did not take a short metal tube straight out into the wheel arch if they felt this drain was needed. The 403 I ran a few years back had been fitted with new seals but these leaked water into the car under the metal trim, I remember fitting slightly different ones which improved the situation but did not totally cure it, can't remember if the drains had been sealed. When the car was originally built the sort of sealers we take for granted now were not around I intend to fit new seals and bed these and the frame into place using a modern flexible sealer, having of course plugged the drain hole.
Watch the ones at the corner of the front screen as well as the rubber pipe discharges on top of the aluminium closing panel behind the front wheel any water there had to find its way out through a small drainage flap at the back of the panel under the outrigger, if that blocked you can guess the rest, far better to drill a hole in the closing panel and extend the pipe out under the wing. This is what Bentley did with similar drains on their MK 6 and R Types.
Geoff.
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