I'd assume the spare electrics not allocated to the Economics may well oust the last of the 3900s (of which there are 8 at Sunderland).

There was a brochure a few weeks ago showing the buses we're meant to be getting. I'll err on the side of caution regarding it for now in case I reveal something I'm not meant to - but what I will say is there wasn't an ADL logo on or in or anywhere near it.