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My bad wording. Just standing normally on its 2 wheels, probably resting against a wall or something to keep it steady for a while. Some people hang their bikes vertically by one wheel, and if you pulled the brakes when it’s hanging like that you might get some air issues.
You want the lever to be the highest point in the system, so any air bubbles can make their way up to the lever. If you had your bike hanging by the front wheel, the calliper would probably be higher than the lever, which would throw off the test I described.
You wouldn’t be the first to wear down a set of pads after a ride in the wet UK grit.
Three usual issues would be:
1) air in the line (needing a brake bleed), 2) the pads need adjusting, or
3) the pads need replacing.
For 1)...
Stand your bike horizontal-ish and pump the lever(s) 6-12 times. If the lever action doesn’t improve see other replies in the previous couple of pages for adjusting pads. If the levers did get firmer, leave the bike horizontal for an hour, then pull the lever once. If the lever action went mushy again, then you need a bleed. If it stayed firm, leave for a day and repeat. If it then goes mushy, you need a bleed. If it stays firm, then sounds like it’s fixed and you’re welcome.