Not now - when the batteries began failing in 2018 and they were parked up (save two), they were replaced by Streetdecks of which a number still remain. Eventually, in 2020, the hybrids got repowered with Euro VI diesels. They have begun to reappear on Park and Ride (now operated commercially?) as well as other routes.
The 56 plate E400s have been so upgraded. It's only the B7TLs and the older B7RLEs that haven't been so treated. As
@Citistar says, the shape of the Excel network may be a bit different as the 15 min frequency to Nailsea might not be sustainable in future as just one example