Regular maintenance is best for a healthy, weed free lawn.
Lawns that have become waterlogged should have started drying out by now. Do not walk on them until they do.
Waterlogging may have led to moss, bare patches and yellowing grass. A spring feed is essential and can be combined with a chemical moss killer. Non chemical means can be introduced in autumn.
Reseed bare patches and sow new lawns.
Start mowing existing lawns if you haven’t already – remember to get the height right. Grass cut too short will not thrive.