Diversions Sunday 3rd March

The Cambridge Half Marathon is on Sunday 3rd March and will result in a number of diversions to Stagecoach buses.
Full details can be found at here.
This is what it says about Busway routes:

Busway A/B Services - 

Towards Cambridge: We will be unable to serve stops located on Castle Street, Round Church Street, New Square and at Drummer Street Bus Station until 10:30. During this time, passengers are advised to board at Milton Road (near the Westbrook Centre) or on Victoria Road. After this time, we will be able to serve Round Church Street and Drummer Street bus station. We will return to normal service from 16:00.

Towards St. Ives: We will be unable to serve Drummer Street bus station, New Square, Jesus Lane and Castle Street bus stops. During this time, passengers are advised board at Milton Road near the Westbrook Centre. We will return to normal service from 16:00.

But, please note, service A no longer runs on Sundays. It has been replaced by the D route, but that information seems not to have reached whoever compiled this update.

Whippet return to Busway

Whippet are returning to the Busway! With effect from 18 February the Swavesey-based operator will be running a new Monday-Friday service, "P", which provides 3 morning rush-hour journeys from Swavesey Busway stop to the Biomedical Campus - with corresponding return journeys in the evening - supplemented by a (generally) 4-per-hour "shuttle" between Drummer Street and the Biomedical Campus via the southern portion of the Busway. The shuttle operates to a slightly less frequent (and more irregular) schedule around the edges of the rush hour (rather like the "U" timetable), to take account of likely traffic conditions (in so far as traffic in Cambridge is ever predictable).

Elswhere there's been speculation that this is tied to the imminent opening of the new Royal Papworth hospital (hence the service "number"), but I've been unable to confirm that.

The route around the Biomedical Campus is the same as that taken by other Busway services - currently that's in an anti-clockwise loop. (That route is likely to change in the spring, I guess, when the new road in front of the Papworth hospital is open and there are new bus stops to serve.)