I suffer very badly from sinus problems, and have been told to get an air purifier by a doctor I saw in the States last time I was there. My mother works for her - she's a wonderful doctor that believes in homeopathic and natural remedies alongside modern medicine. She's already got me on a very stringent neti pot regime that has slightly improved my condition, but as I'm still suffering, I think it's time I shell out for an air purifier.
She recommended Honeywell air purifiers. They certainly seem to get very good reviews online, and my mother is very happy with hers. The only kicker is....they don't seem to be available here in the UK!! I have been searching for the past week or so online, and I'm getting very frustrated indeed.

I want the one my mother has. It's got a permanent filter, so no added expense, and is reasonably quiet:
Here:
The only ones I can find here in the UK have either very poor reviews, or require frequent and very expensive filter changes. Very rarely do I bemoan the lack of certain products here in the UK, but this one has me tearing my hair out - why aren't Honeywell products available here?! I am even considering ordering one in the States and paying through the nose to have it sent over - I am really getting that desperate!!
Can anyone recommend me a good air purifier available here in the UK, preferably one with permanent filters and reasonably quiet operation? I can probably pay up to £200.
ps - not sure this is the right forum. Please move if appropriate!