When the Thameslink Programme is completed, destinations on the Great Northern lines more towns north and south of the river will be connected by rail, but re-establishment of a link to the beneath Kings Cross / St Pancras is likely to mean some loss of commuter paths on the Midland route.
The inclusion of GN destinations in future Thameslink suggests that commuter demand on the Midland is not expected to be “at capacity” in the foreseeable future.
And as can be seen from the proposed year 2018 service pattern (above), demand does not seem to justify all Thameslink Midland services running as far north as Bedford. So, spare capacity on Thameslink could be used to provide a second rail access to the city of Milton Keynes.
The Sundon — Ridgmont connection concept would provide the same commuter benefits as HS2, at perhaps five per cent of the cost.