Use, not so much, enter, yes, sometimes - depends on the road markings.
Cycle lanes.
These are shown by road markings and signs. You MUST NOT drive or park in a cycle lane marked by a solid white line during its times of operation. Do not drive or park in a cycle lane marked by a broken white line unless it is unavoidable. You MUST NOT park in any cycle lane whilst waiting restrictions apply.
Law RTRA sects 5 & 8
Use, not so much, enter, yes, sometimes - depends on the road markings.
https://www.gov.uk/general-rules-all-drivers-riders-103-to-158/multilane-carriageways-133-to-143