It is the medical device manufacturer that is legally responsible for identifying when they need to undertake field action to address a safety risk with their devices. They should always issue a Field Safety Notice (FSN) when they do so to explain what they are doing and why. For cardiac implantable electronic devices (CIEDs) companies usually target their FSN to all customers or centres they can identify who received the devices or are managing affected patients. So some FSNs, affecting many patients, go to a large number of UK pacing centres, while others may be targeted to only a few.
Always act on any FSN you receive, straightaway. Do not ignore them.
MHRA will only issue a further safety communication linked to an FSN in extremely rare circumstances.