It is a zebra (ie pedestrian only) crossing.
Highway Code rule 81:
"Do not ride across a pelican, puffin or zebra crossing."

You need signage to indicate that a formal crossing may be used by cyclists or horses - by default they are for exclusive pedestrian use (same as for pavements). In the case of a zebra crossing this would be indicated by a parallel crossing edged by large white square dots. This zebra crossing has no such markings, therefore it is not a cycle crossing.