Could be something to do with the Cycle track as they are digging up Buckland Avenue at the moment and moving down that way,get on your bike Howard,Vic welded it so you are ok.
If you knew what I know,we would both be in trouble!
I've checked with Kent Highway Services and they advise that there are no works planned for Marine Parade during this period. I became suspicious when I saw the start date of 8th March as it is a Tuesday and it is normal for works to start on a Monday.
It does seem to ring a bell from last year but where the sign has suddenly come from is a bit of a mystery.