ESCC are consulting about the future of the library service. You have until 17 December to submit your views: see https://consultation.eastsussex.gov.uk/economy-transport-environment/draft-strategy/ for details of how to take part.
This includes proposals to close the mobile library service.
I fear that the mobile library service may not survive, whatever anyone says in the consultation, but there are some interesting ideas to offset the closure. For example, as a community, we could borrow a larger number of books for a longer period and then “sub-lend” them from the Village Hall.