Agreed. I have not yet (but will definitely) be looking to getting the Long Wave service (via DAB or internet) so as to avoid the whole W+P marathon.
I think it a very poor decision to put it on FM, and given how (presumably) few fishermen will be out at sea tomorrow, don't understand the choice of using FM over Long Wave, except for the fact they presumably want it as Stereo. Then again, it's presumably just one more daft experiment from the new head of Radio 4, she who decide to cut the length of Y+Y at lunch time to put in the daft 'interview over a game of chess' shows and so forth... ignoring the fact there's a perfectly good 15 minute slot after the World at One.
Another the daft decision was to extend WatO - when we already had 6.5 hours of news on a weekday, they wanted to push it up to 6.75 hours a day, plenty of it being repeated sound clips... if you've heard a clip at 13:00, odds are the same clip will be on at 17:00, 18:00 and 22:00, and the midnight news.
Of course, they could have done something better such as use Radio 4 Extra for this 10 hour marathon, but of course the idiots at the BBC forgot to make R4 Extra Stereo (at least on DAB, I don't know if they carry stereo audio on the internet - but if they don't they blasted well should, given they have previously commissioned new material (eg Comedy shows from Edinburgh Festival), though I know the spending cuts mean they won't commission anything new for the time being (they blew all the budget on a 10 hour W+P drama, didn't they!)