Hi - Update:
Checked the grommets and they are all seated correctly. So purchased some liquid rubber and coated the grommets and that part of the engine bay in rubber. I also coated the seams around where the aircon pipes go into the car. It has since rained quite heavily and so far no leaks...
Ford Puma 1999 T Plate 1.7.
I have an oil leak and I have a pretty good idea where it is coming from - either the "O" ring on the dip stick tube has rotted - so I am replacing that anyway and/or the gasket seal needs replacing on the sump. So I have ordered both parts, 6 litres of oil, oil...