Its in the October Newsletter, piece by Northern on their recruitment and training says a Driver Team Manager, Conductor Team Manager and 20 drivers have been recruited and drivers have started route familiarisation with GBRF on their biomass trains. It also says the new CTM will be based at a proposed Ashington conductor depot, page 5 of link below:
Just a pedantic point but it states Driver Team Managers have started familiarisation. No mainline Northern drivers have been on the GBRF trains and probably won't for a while.