I've always thought that off peak, it would be better to extend the Bletchley-Bedford service to Corby, which could possibly be done with just one additional DMU? EMT could still run peak hours direct services. That would have the dual advantage that passengers could connect directly with thameslink services at Bedford off peak, and it would give the Bletchley services one more DMU to operate their service at peak time, meaning a more frequent service on that line would be possible - and avoid those occasions where the whole Bedford to Bletchley line has to be shut because one of the two units is out of service (mind you, the taxi's they provide when the train is broken are very comfortable).