Sow outside: runner beans, dwarf French beans - we may leave for a week or two if the soil has not warmed up.
Sow inside in modules/trays: a few spare runner beans, a few spare French beans - we may leave for a week or two if the soil has not warmed up.
Charles Dowding makes his outside sowings around mid-May.

Sow inside in modules/trays: courgettes and squash

Plant out leek pot if not done last week;  if leeks are too small; leave until next week.

UPDATE

We did not sow outside - it is a cold season so better left for a week.
We built our runner bean frame.