Our Trusts' "official" policy is that we are entitled to the same protection as an outside contractor (who must be sent properly decontaminated equipment for repair) so we are only supposed to accept equipment into the workshop if it is accompanied by a decontamination certificate. We use the one out of the MDA document and just photocopy it !
In practice there is a lot of equipment which comes to us from various sources and no one is prepared to put their name on anything to say it is clean. The equipment coming off the Wards always has a certificate, but is often "dirty" - because the wards simply don't have the facilities or the knowledge to clean it properly.
Still, Controls Assurance will sort it all out for us !