Update:
I rang each week and, after what seemed like an age, the five weeks passed and case closed, no objections. Phew.
I had been warned that people tend to leave it to the last day or two to make their objection, which is all well and good but, it means that they somewhat burn the bridge that might have led to a compromise or negotiation over the plans.
We approached all the neighbours and explained our intentions and asked if they could see any issues or anything they might like us to reconsider. It helped but we still feared we'd get a few objections.
Thank Christ that's over!!
Roll on the next three weeks now...