(01 Jun 2016, 4:32 pm)South Tyne Lad wrote That's a thing Bazza asked me on Flickr the other day.
The Contract's which require Seatbelts can not be ran by 635/636, So they cannot be spares for Hexham I don't think.
I wouldn't be surprised if there put in storage for the winter till the AD122 starts again next year.
I wouldn't think that there are issues regarding them being spares for Hexham - especially as it is only one school route which requires Seatbelts anyway, which the branded SRs can easily do if 618 is unavailable allowing 635/636 to cover for them on the Tynedale Links routes.