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Yes, these female are B. anglicus.

I meant the B. 'anglicus' I found before, just checking if these are not Bibio leucopterus.
You are sure the Bibio, showed under 2 are Bibio leucopterus? are you?
You say 'The inner tiabial spur is almost equal in length to the outer spur', are these the red spines on femur III?

What is the status of B. leucopterus in the Netherlands Theo?;

1) common
2) quite common
3) rare
4) very rare

I'll show you just another picture of the two species, you can see the difference in size!
left: B. cf marci
right: B. cf leucopterus