I have been done twice for wrong recognition, 1 for speeding and the 2nd for a congestion charge in London.
Both had my registration number correct, but the first was for speeding outside London at 7-15am on a Sunday when I was asleep in my bed in Newmarket.
The second I was in Newmarket and had proof where I was at that time.
On both occasions I had to send 6 photos of my car from different angles and it turned out that my car had been cloned.
Fight it if I were you even though you were guilty, they make to much money from us motorist as it is, with road tax, fuel tax etc, etc. Fight the ********.