I have a very similar situation, and here are a set of answers to these questuions:
When was the house built? 1980
Were any planning conditions placed in the application to cater for surface water run-off? NO
Were any drainage ditches into adjacent fields off the roadway blocked? (Blocking existing is illegal, making new drainage requires planning / agreement) Look for bags of cement dropped into open drains, an old trick. NO
Does your driveway opening to the road block a drainage ditch? NO
Did the roadway drain into the field before you built your house there? Don't know, probably not.
Is the flooding a new phenomenon? NO
Do you insurers know? NO.