Bilge blower arrived and from a cursory look it would seem to do the trick. It is a snail shape one I got so will fit in well.
Sorry BB I don't know how to post links but if you search Bilge Blower on flea bay you will see the one I mean. Think it's about five down from the top and as I said, snail shaped.
found the how to anorl but sadly most of the pics are gone
https://www.landyzone.co.uk/land-ro...ater-blower-with-cheaper-bilge-blower.267512/
Thanks BB. Will have a go next time I've got anything worthwhile to report.Just copy the address bar of the page you want to link and paste it straight into the reply box here
For future reference