It's this one here:http://www.lloydspharmacy.com/wps/portal/products/medicalelectrical/healthandwellbeing/allergy
The second one. I have the first one too I'd be ok to sell but won't list it due to hygiene reasons.
The air purifier is in excellent condition. Used, but totally cleaned out of dust, may as well be new, comes with original box.
It's on the site for £10 plus I think £3.95 postage. I'm listing it for £9 delivered, open to reasonable offers, taking into account potentially hefty postage costs.