I echo the above. It is generally the wrong season to be finding 'field mushrooms' - assuming you mean Agaricus campestris?, but I too have seen some typically autumnal species out in the past few weeks. If it's not St Georges, then it could be one of a myriad of Lepista's (Blewits), or something from Agaricus genus, would love to see some pics/find out what it is you have!
And wow, CotW out already? I'd best get me basket out and start checking my spots!