Thanks you for your feedback.

I am in Manchester UK. Last years attempt at weed and feed had some success in cutting back the weed population but the grass didn't flourish as I had hoped. I think your crap grass assumption is pretty accurate.

Today I have strimmed and mowed the lawn and weeded the flower beds. The lawn is now very patchy with lots of weed shoots visible, also quite a bit of moss. I've raked the area over but now am in two minds wether to scalp and reseed/turf or persevere and review in Autumn.

If I choose to wait I will certainly aerate and fertilize as advised (not sure which order to do this though) and mow regular on a high setting. Perhaps also using roundup on the weeds as they pop up.

Any further comments would be appreciated, I will attempt to add some more photos too.

Thanks Mark