This just popped into my head. Would be surprised if anything was ordered for the NE anytime soon but if Arriva do order late this year / next year..........I could perhaps see the X93 getting new E400MMCs (ZF). 

Given the recent events affecting everywhere globally and other reasons why people perhaps might not go abroad and opt for a 'staycation', the X93 would be the perfect route in terms of growth and attracting tourists.

The B9TLs with 2x kept as 'NE floats' could then be sent to Ashington for the X14 or X20 allowing older E400s to be cascaded down and older double deck vehicles to be withdrawn.