From the 9th (I think - may be 10th?) the Uxbridge-Acton section of
the 207 becomes a double-decker route 427. The remainder of the route
(Hayes By-Pass-Shepherd's Bush) stays as 207 with Burny Buses.

607 also goes low-floor.

There's a leaflet on the TfL website now -
http://www.tfl.gov.uk/buses/downloads/route-207.pdf.

Interestingly, this says that:

"Oyster Pre Pay users should board through **any** door and touch their
card flat on the yellow reader as they board the bus". (Emphasis mine).

N207 Holborn-Uxbridge keeps double deckers but is more frequent.

--
Ashley