These were all photographed in the National Trust's landscape gardens at Stowe, Buckingamshire on Monday 30th August.
I think (hope!) I have managed to identify the first 3 but will be grateful for confirmation (or otherwise!):
Brown Rollrim -
Paxillus involutus, growing in grass under lime trees beside a lake.
Fairy Ring Champignon -
Marasmius oreades, in grass in the parkland.
A very old and tatty Dyer's Mazegill -
Phaeolus schweinitzii?? This was growing - or possibly not, as it seemed to have been recently strimmed off - in an area of rough grass around where a tree had once stood but where only the root area and the odd trace of stump remained. The edges were velvety in texture.
The next ones I haven't a clue about so all ideas and suggestions more than welcomed!
IF the above
is Phaeolus, then I am assuming the ex-tree was a conifer in which case this Boletus was growing within the same root area. There were a couple, with brown caps, large yellowy pores which bruised blue and reddish stipes: the small one seemed malformed in that the stipe was at one side rather than central.
These were growing in grass, under a Hawthorn and not far from a Beech, between a path and a lake. The first which had already been picked/kicked appeared to consist of several fused and overlapping fruit bodies; the last I picked "fresh" as it were, and the gills on this were whiter. The caps were whitish and from the decurrent gills I wondered about Clitocybe sp.? They did have a strong, somewhat unpleasant smell which I couldn't place although it did remind me of something (non fungi) I have smelled relatively recently, only I just can't place
what or
where!

Possibly animal-related but not cow-dung...

Himself refused point blank to have a sniff at any fungus, particularly one that might small nasty so no help from that quarter (half!) to jog my memory.
Sorry about the lengthy post and not too good photos but hopefully some ideas will be forthcoming. Thanks for your time and patience!