I believe there is no charge for having a food allergy test on the NHS otherwise you can refer to a private clinic and pay. Do you have any current evidence that you’re intolerant or allergic to any foods?
It depends on your GP Surgery policy and the reffreral ceiteria. Usually if its a life threatening allergy then it will be a refferal to an allergy clinic and perhaps an epi pen in the meantime. If its life disruptive for example nocturnal asthama or eczema and its causing other symptoms then a refferal will most likley be considered. For anything else its at your GPs discretion and the qualiftying criteria for the refferal.