No issues really, just standard planning delays. It took over 4 months to get a basic dormer conversion! Every time a new deadline loomed, the planners would ask for another (often spurious) bit of information which they would then take 6-8 weeks to review...
We haven't got that far yet!
This is what was granted though:
https://publicaccess3.croydon.gov.uk/online-applications/applicationDetails.do?activeTab=documents&keyVal=R0Z51QJLK7D00