Hello again,
When I suggested contacting Calor direct I was referring to the head office. I suspect that your 'Calor center' is a local private company who is franchised to sell Calor products.
In correspondence I have had with Calor head Office, it became clear that head office were not really in control of their outlets, and despite having announced the recall, they did not seem to understand the mixed messages their announcements had caused, where some 'dealers' were not following the protocols laid down by head office in responding to customers requests for exchanges following the public announcement.
Calor think they may have a problem with some of the affected batch, but in reality they don't know how many if any are actually affected, The problem is that if only one is affected, they can't predict when it may fail. To be honest I was not impressed with their apparent lack of concern with the progress of their recall.
If you do not get any positive response from Calor head office, I suggest you contact Warwickshire Trading Standards who are apparently working with Calor to monitor the recall. Calor as owners of the bottles, are legally responsible for the condition of the stock they hire out.