I have found a PATAS case (3 identical actually) that mirror your exact circumstances.
Case Reference: 2150012184
Appellant: Mr Naeem Lone
Authority: Harrow
VRM: NL52VDX
PCN: HR85802354
Contravention Date: 29 Oct 2014
Contravention Time: 22:29
Contravention Location: Christchurch Avenue
Penalty Amount: £130.00
Contravention: Using a route restricted to certain vehicles
Decision Date: 23 Feb 2015
Adjudicator: Teresa Brennan
Appeal Decision: Allowed
Direction: cancel the Penalty Charge Notice.
Reasons: Mr Lone attended today. He appeals against three Penalty Charge Notices all issued for the same contravention. It is alleged that on 27th October, 29th October and 2nd November 2014 the appellant's car used a route in Christchurch Avenue restricted to certain vehicles.
Mr Lone does not dispute that his car was seen in the bus and cycle route. He raises issues about the signing of the restriction.
On each occasion Mr Lone had been to the Harrow Leisure Centre. He drove right out of the Leisure Centre. I find that he would not have driven past the warning sign shown in the local authority's photographs HR3 and 4 the sign is clearly situated before the turning to the Leisure Centre as it advises motorists that the centre is on the right and that access for cars and bikes is prohibited 250 yards ahead. IN its case summary the local authority states that motorists have ample opportunity to understand the junction ahead because of the warning signs. The warnings are given to prevent motorists having to perform a U turn at the roundabout. The local authority provides photographs HR5 and 6 which show the signs at the roundabout. The sign indicating that there is no entry except for buses is at the roundabout.
The local authority states that it wishes to avoid motorists carrying out U turns at this location. I am not satisfied on the evidence that I have seen that there are sufficient warning signs of the prohibition ahead for motorists approaching the roundabout who have turned right out of the leisure centre.
I allow the appeal against each of the Penalty Charge Notices.
---------------------------Identical to 2150011239 & 2150011192 enter any of the numbers in at the PATAS search page,
http://www.patasregistersofappeals.org.uk/StatReg/StatRegAdvanced.aspx