As ORB points out. the TFL website says you have until midnight on day #3 to pay.

What part of the rules is being relied on to say you've infringed the rules by creating an account and paying within that timescale?

Out of interest what was the actual route?

It must have been some diversion. The M3 doesn't start until Sunbury (well outside the current ULEZ) and there is a relatively straightforward diversion to the M25 skirting around the edge of Staines past the reservoirs on the A308.

Even if you end up heading the other way on the A316 towards London, it's possible to get all the way to the South Circular nearly at Chiswick, around the south circular a couple of miles to the north and back out on the M4 without entering the ULEZ.

The route going was up the M3 and just followed the sat nav to Wembley, no problem with ulez. I set up the sat nav to come home but it used a different route, that's where the problem occurred.

How supercar owners dodge the Ulez charge despite massive CO2 emissions | Daily Mail Online

ULEZ is nothing but a money grabbing exercise which is grossly unfair to the majority. All this Carbon? emissions is fine but should be phased in at a much slower rate. There are two oil fields in a state in the east middle east that have stopped flaming off the gas from its wells These 2 oil fields are apparently giving out more carbon than the whole of the UK in a year