Unable to run check, as unable to create lock

I get this on a check:

password is correct
create exclusive lock for repository
unable to create lock in backend: repository is already locked by PID 5267 on pc-00157.bjsystems.co.uk by brianr (UID 1000, GID 1000)
lock was created at 2018-01-13 16:04:02 (15h36m54.717653216s ago)
storage ID 353cac4c

where is the pid/lock file for restic? I’ve tried a reboot, and searched for *.pid and *.lock.

Cheers Brian

Ask the authors of ‘restic’?

oops - sorry - got the wrong forum! Brain fade strikes again!!