GSV for July 2022 on Tennyson Road shows this yellow, non-traffic warning sign at the T-junction. This is the only warning sign shown, so a this view is four years ago, is it still there, or are there better, and more advanced signs as one approaches the T-junction ? My view is that the yellow sign is inadequate to warn of the restriction.
Needless to say, Merton will reject all your reps, and cleverly re-offer the discount to encourage you to pay-up. They, like all the other London councils, ruthlessly game the system to maximise the cash flow, knowing that few people are willing to risk the full penalty at London Tribunals.