@gethin_allen They've been stored correctly, aimed for personal use by site specific instructors (not my call), we have the classic DMM Brenin's for client use.
@timjones I've already removed them from circulation but if someone was able to say 'yes I have this exact harness and paperwork that gives clear manufacturer advice (or a reliable link to manufacturer advice)' it would be useful. This post was admittedly a gamble that someone might have it. Likelihood is I would have removed them anyway but a paper trail is good to have.
@mik82 A fascinating document for rules of thumb and a nice bit of paperwork to use to rubber stamp my instinct to permanently remove them from circulation, interesting that it conflicts with the advice I received from climbx (reinforces my lack of confidence in the brand).
Thanks all for the info you've all been able to provide that had eluded me.
Unfortunately I had no influence over the purchase of these (If it's reassuring, all other kit purchased has it's lifetime/manufacture date/advised retirement time/advised inspection schedule checked ahead of purchase. It is all asset logged with this info and a manual with this info is filed for future reference), it all also has a regular inspection schedule.
Thanks again and have a good weekend.