In a post on the 'Friends of the PSV Circle' Facebook group, it has been noted that Enviro400EV AR74ZEB has been made by ADL at Falkirk for Arriva. There doesn't appear to be confirmation of where this is due to go, but suggestions it may be utilised as a trial vehicle? The North East alone are expecting electric double decks for Blyth and Durham, so we may see it here. 

There is also a new E400 MMC pictured, apparently for Southern Counties, but evidently investment is happening post-takeover when also taking into account the large volume of B8RLEs on order for elsewhere in the country.