Where can I get the cheapest turbinate surgery in the UK or abroad?

Medical tourism has becoming increasingly popular in recent years; patients 
have been flying out of the U.S. for plastic surgery, lured by lower prices. 
However, a parallel trend has also appeared: plastic surgeons in the United 
States are finding themselves treating an increasing number of patients who 
plastic surgery abroad, correcting complications and errors. A survey by the 
American Society of Plastic Surgeons found that 80% of the responding doctors 
had treated American medical tourists for complications including infection, 
contour abnormalities, and hematoma.
Medical tourists are often led to believe that they will receive the same 
quality of care for a lower price in a foreign clinic. But while it is true that 
the cost of plastic surgery in some foreign countries is lower, this is often 
because the quality of care and surgery is compromised. Such patients also seem 
to neglect the possibility of complications and the need for a follow-up 
visit. A number of patients have died in Dominican Republic for example following cosmetic procedures. In addition to the risks posed by sub-standard medical care abroad, medical 
tourists must consider the risks of injections and implants in other countries. 
The recent crisis with French breast implant maker Poly Implant Prothese (PIP) 
exemplifies this problem. PIP used industrial- rather than medical-grade 
silicone on their implants in an effort to reduce costs, a measure which 
probably increased the danger of rupture. PIP implants have not been used in the 
United States since 2000. Removal of these implants has been recommended by the 
International Society of Aesthetic Plastic Surgery.
It is often the case that medical tourists end up spending more 
money because they have to pay to treat complications from their overseas 
surgery.

First it is important to ensure that your obstruction is due to turbinate hypertrophy.  There are other very common causes for obstruction including internal nasal valve collapse and external nasal valve collapse.  Once this is ascertained, you can undergo the correct procedure.  It would seem the UK with its national health care system should have the best prices for surgery.