How do you know you were in contravention at 9.20, the sign doesn't say anything about extent of restriction. Was it 0001- H hour or 0900 to 0915 and was it only on 10th or what?
IMO, the sign is defective as it doesn't give hours or days.
I would have thought that if no time explicit time is given on a dated suspension sign, then the assumption should be whole 24 hours.
However I had a little delve into the internet to find out if the sign is compliant. The following may give me a get out.
The Traffic Signs, Regulations and General Directions 2016 do not define the yellow suspension sign used by most enforcement authorities to control parking.
Hence it is necessary for enforcement authorities to seek DfT authorisation for such signs, under Sections 64 and 65 of the Road Traffic Regulation Act 1984.
Someone did a FOI request to DOT to establish this in 2020.
https://www.whatdotheyknow.com/request/authority_for_parking_suspension We encourage authorities to apply for an authorisation for their parking
suspension signs which permits their use at any appropriate location on their
roads. The authorisation specifies the information that can be shown on the
sign, and its size, colour and character. All authorisations for this traffic sign
which have been issued since 1 January 2011 may be viewed on the
Department’s authorisation database at: The reply included a list of enforcement authorities who have DfT authorisation.
There is no sign of Greenwich, or indeed any authorities, seeking authorisation for suspension signs.
www.dft.gov.uk/traffic-auths/ There is a case in London Tribunals which won on similar basis.
Case from 2010