URGENT WARNING ⚠️ please share
Please, please do send your paperwork to the correct address.  Post is still mailed to all three old addresses. Of particular concern is that the PO Box 10614, Sleaford is no longer occupied and redelivery failing. 
As you will be aware the loss of passports in particular is a nightmare for everyone concerned. During the last year this has become more frequent and December and January has been dreadful. 
Could you all remove the old forms from the back of your passports and only use the forms available on the website. I also advise you to use recorded delivery at the very least. This way we do at least know when the item is lost and you may be able to claim the funds to provide a replacement. When we return passports we always have proof of posting receipts / certificates. 
Please save yourself the grief – get it right
The correct address is: AQHA UK, Oakridge Arena, Swinderby Road, Collingham, Newark, Nottinghamshire, NG23 7NZ