Allergy Testing

Pretty much everyone I know is allergic to something. Both my mother and brother-in-law are allergic to nuts, my father and brother get migraines if they eat certain foods, my stepmother has problems eating scampi, my partner thinks he's allergic to gluten or wheat... I myself have suffered from hayfever since my mid-teens and am allergic to touching at least one species of plant.

A few weeks ago I had a rather uncomfortable itching reaction to something (possibly edible, possibly chemical) whilst staying at a friends and it made me wonder if it might be an idea to undergo allergy testing. We own several books on nutritional health and most come with some sort of suggestion for a diet plan for eliminating and reintroducing foods, but given the variety of things that can cause an allergic reaction I'm unsure that I would ever put my finger on it even if I tried that technique. The NHS make it quite clear on their website that most methods of allergy testing aren't 100% effective, but then there are also dozens of testimonials from people whose lives have been turned around after finding they were allergic to something they'd been eating regularly for years. An example of someone who found out they were allergic to cos lettuce (not any other kind) and sunflower seeds demonstrates just how difficult it would be to find that out using an elimination and reintroduction diet.

So I'm considering undergoing allergy testing. Probably a waste of money, but then it only takes an hour and I wouldn't need to do it more than once unless I developed other allergies later in life (which does happen). I'm not going to be conned by one of those sites on the internet asking you to send off a hair, so I've found a local clinic run by an NHS nurse, but thought I would consult my fellow bloggers before booking an appointment. As I said pretty much everyone I know thinks they know what they are allergic to, but has anyone actually undergone testing and if so would they recommend a particular method?