@Fer360csIs this your first entry on this road since the last week of nov? If yes then
On the short clip of the contravention, does it show your car pause or stop at the foot of the entrance before entering the road? If yes this I guess you have a decent chance of appealing.
Your primary point of appeal would be
1) could not reverse on to the a4 due to traffic (breaking the rule 201 of the traffic code)
2) lack of warning signs on the A4.
Note - you would need to prove that the temp warning signs on the A4 before the Rivercourt road were switched off.
I meant this sign in the pic below -
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