Posted: Yesterday at 17:25
Rosemummy drainage will be the main issue. I presume you're on clay ( you wouldn't get a mud bath otherwise) and that can be a major task to remedy. I work with some lawns with the same issues and even east facing lawns can be quite lush with the right regime of constantly adding grit to the lawns. One method one of my clients tried was to import several tons of pea shingle and spread it over the lawn. At first I was very dubious as to the result. So I suggested (after he'd spread it without my knowledge) to try rolling it in and sow grass seed directly on top. In the first year it looked very much a mess until the autumn. The seed took so we scarified and resowed more seed aerated and spiked and brushed in more grit and sharp sand.
I was still dubious and feared a further summers work to rectify things but to my surprise by this spring it looked pretty good. It was cut aerated again and fed. Through this summer it's flourished.
I can't say it was my idea and to be honest I never thought it would work but it has.
It's only an idea, unconventional I know and I wouldn't recommend it to everyone but it's something to consider.