This might not be aplicable, especially since it's Saab and records might be tricky to get, but I managed to get a non euro-4 car exempted from the ULEZ.
It took a homologation certificate (teh bit that might be impossible) showing its nox emissions and then a submission to tfl for exemption. Took about a month to gather all the bits.
Thanks yes i have heard of people doing this but as you say tricky from a now non existent company. Would definitely like to hear more about it though!
This might not be aplicable, especially since it's Saab and records might be tricky to get, but I managed to get a non euro-4 car exempted from the ULEZ.
It took a homologation certificate (teh bit that might be impossible) showing its nox emissions and then a submission to tfl for exemption. Took about a month to gather all the bits.