@Mike Summers wrote:
If they are all diesels you may well be right. Petrol vehicles should be ok.
There is however always a way. I suggest you contact the management at Alexandra Palace as I am sure you are not the first mobility impaired prospective visitor they have had.
As I understand it you are not banned from accessing the LEZ, you just have to pay a fee for the pleasure. Welcome to London.
I have mailed them and not received a reply. The fee is £100 per day and that has put it out of the question. I will have to content myself with visiting various Wayfarer meetings and dinghy shows during the year:-(