Bumble bees are the ones that are solitary and live in the ground, yeah?
What size (roughly) are their Larvae ? Was digging in the back green (can't remember why I was digging in the Back green, trying desperately and failing, to remember what time of year this was and how deep I was)saw what looked like a caterpillar/maggot thought at the time that it was a bit big for a bee but some of the Bumble bees this year seem to be huge so I was wondering ... No biggie just a (very)minor niggle at the back of my mind.