Not just the UK, there are parts of the southern US that refer to Crane Flies as DLLs (also "mosquito hawks" even though they don't prey on mosquitos). You also sometimes hear "Grand Daddy Longlegs".

I can vouch for New Orleans at least as they are everywhere right now (there was a discussion on r/NewOrleans just a few days back about this very topic). One thing I learned in that discussion is the same person might call both of them DLLs. That seems impossibly illogical to me but it apparently happens.