Thanks so much that is all very useful
Please let us know how you get on.
There are many threads on this forum where people seek advice or say that they found something useful but we don’t find out whether the practicalities matched expectation or why.
We got a VentAxia constant-running extractor, then got an electrician in to install it - cylindrical ducting straight thru both leaves on external wall and thru cavity insulation, ramps up when it detects steam (and also if wind blows strongly into it.) Very pleased with performance and with resulting mould-discouragement.
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It looks as though you have a constant flow extractor rather than a constant pressure one. They are ideal for exposed/blowy locations.