Okay, thanks for the thorough reply...Yes, @Steve1122, Abbott replace NHS provided sensors.
Actually the whole process is fundamentally dubious in that public funded acquisitions should be subject to "Treasury Rules". This should mean that not only is there a nominated and "findable" procurement manager for any public contract (not findable as far as I can determine) but purchase contracts have various hoops to be jumped through in terms of security of the seller (not in question here, I assume) but value for public money (including frequent reviews, which don't exist as far as I can see) and certainly do not permit the seller to police their own delivery faults and suchlike. Supply problems should be taken to the Procurement Manager for that contract, adding to that manager's remit to ensure best value for the public purse. All of this seems to be ignored when it comes to the NHS. Presumably by delegating authority and responsibility to either Hospital Trusts or the (former CCGs and now) Integrated Care Boards (ICBs) the Public Accountability overseen by the Treasury is at the very least ignored and possibly just blatantly not complied with. But this is part of why individuals in the NHS are frequently trying to do their best but the NHS is so plainly wasteful. Very little accountability.
Anyway from your perspective as a user of an NHS supplied medication (which includes tech) you go back to the provider, Abbott.