In-App Filter Purchase showing as Out Of Stock - Incorrect version shown (Solved)

Hello community,

My first time posting here, so go easy on me :)

I have a Dyson Pure Hot + Cold (I think this is HP04) and live in London. Its filter is at the end of its life, so the app is encouraging me to buy a replacement. In the past this has not been a problem, and I have replaced the filter a few times over the past few years. 
 

However, Dyson’s site is showing theLe replacement filters as sold out, and there is no indication of when they will be back in stock. 
 

Two questions:

1. Any idea when they may be back in stock?
2. Any suggestions on other suppliers in the UK. Amazon has a lot of alternatives which are comparable with this machine, but I would rather stick with an official one. 
    

thanks in advance!