We are planning to show up this year.

However, compared to our last visit back in 2018 or 19 the hotel situation seems much more difficult (getting rooms at reasonable prices).
Additionally there's the ULEZ issue that's new.
My idea now is to book an accomodation outside of all these zones and to get to Excel by public transport.
As we'll depart after the show via Dover an accommodation to the south seems reasonable to me.
Maybe someone here can help me to find a town/area that is suitable to reach Excel by train and/or DLR on Saturday without too much of travelling time?
Thanks