Interestingly they never actually had a sign saying to take off your shoes for a long time when it was compulsory to do so (after the failed security audit) ... but they got the floor disinfecting sign up very quickly ... the cleaners are very efficient at DUB
Shoe removal is currently sort of non compulsory ... seems a bit to vary with the weather / mood of the security people etc - if they think your shoes look like they'll set the machine off they'll tell you to take them off and if you do set the machine off you'll be sent back to remove shoes/belt ...