[UPDATE (26 July): The filter has now been changed. See the RISE instrument page for further details.]
The RISE fast-readout camera is having its "V+R" filter replaced with a 720 nm long-pass filter on 26th July 2017. This is being done to enhance the capabilities of the camera with regard to measurement of exoplanet transits around late-type, red dwarf stars.
More details of the filter switch can be found in the filter section of the RISE instrument page here.