Looking at what is on sale for April 2021 (not the timetable section), the based aircraft situation appears to be:
CWL - 1x J41
HUY - 1x J41
LBA - 2x J41
MME - 2x J41, 1x E70 (LHR)
SOU - 3x ATR (BHD/DUB/MAN)
The timetable has gaps all over the place and fleet utilisation is very low.
Most days there's an early LBA - SOU, but no return on sale, similarly a SOU-MME-ABZ but no flights starting ABZ the next day. Obviously very much a work in progress and all subject to covid restrictions and demand, but plenty of scope for Eastern to expand if they wanted to be a serious player in the regional game.