Just before I posted this thread I found a link to a site offering the two respirators (Trend Airsheild and the Air Cap) as alternatives to my Recal.
I sent them an email asking much the same question and I thought you might like to read the reply:
"Mick
Your presumptions are largely correct. The few spares that 3M did release ran out well over 12 months ago.
The "crime" of what 3M did was that they didn't even take any steps to secure a supply of filters: they simply worked like good accountants and measured the write-off value of the stock and compared it to the value of complete units. It is abundantly clear that no effort whatsoever was made to match spare parts run rates with market needs and a suitable obsolescence date - maybe 3 years would have been reasonable. Hence there were huge amounts of spare chargers that ended up being dumped but almost no batteries or filters, which people need regularly. Even two years on I could go ballistic about their penny-pinching, mean-minded, anti-humanitarian actions: effectively throwing their clients to the dogs of disease caused by particle inhalation. And to do it with no notice whatsoever: they were selling units for a premium price one day and unable to supply the most basic spare part the next. The only reason that I, or anyone else in the industry, got any notice at all was because a careless (or embittered) 3M employee let it slip to me that the product was internally classed as obsolete and I phoned around the trade to try to get some representation together. Even their largest UK distributor was unaware until I called them!
I believe that I have left in stock a single pack of face seals if that's what you need, along with a pack of visor overlays. I may also have a European charger, but that's about it (I'll have to check physically to be sure.) I don't think anyone else in the UK will even talk to you about spare parts for Airlites."
Ineresting eh? At least I am now completely aware of the situation and can now justify the expense of a new respirator (despite the old one still working :evil:
I'm not sure I should divulge the source openly given the content but I will say I was impressed with the level of service this company offers and will give you details via PM if you want them.