Yes this was G-EHMS.
No it wasn't the same incident. This was in the last 2 weeks.
No it wasn't a road sign. This was a section of frontage of a tyre fitting garage that had previously been damaged (cause unknown) and had a very basic fix. This blew off with the downdraught when the Explorer was landing and flew through the blades. The site was I am told approximately 4D in size with no way of telling that the sign wasn't very secure. All the other sections were completely solid in their fixings.
No the crew's judgement was not at fault.