A couple of christmases ago my daughter had a mild reaction to a certain sweet in a quality street tin that she ate, i have no idea which one though.

She cam out in a hive type rash that came and went in various places all over her body for 2 days before i took her to the chemist and got some piriton which sorted her out.

Ever since she has kept clear of some nuts but has been exposed to others - the ones she has eaten that i know are fine are walnuts and hazelnuts. Plus she has been eating normal things that say "may contain traces of nuts"

She has been fine since but i'm just worried that it could have been a certain nut she hasn't tried since and if she happens to have it again the reaction could be a lot worse.

I didn't take her to the doctor last time so there is no record of it happening to her so i'm wondering if i do take her to the doctor to ask about testing, will it be taken seriously or will be just be told to wait til it happens again?

Also, my friend who does look after her sometimes insists shes not allergic to nuts but that is simply because she did not see the reaction and her son had a really severe reaction to something last year and of course because her sons was worse and he has had testing it means my DD isn't allergic - shes the kind of person that if you are not visibly ill then you are not ill full stop.
She has tried giving her a peanut butter sandwich but my DD knows not to eat it.

Yes. Get her tested, for your peace of mind. It would be stupid to stay worried about something when you could so easily find out. So she's probably fine and it would have been unnecessary, but so what? You'll have had that reassurance that you need. There's nothing wrong with making sure. You'll feel better and that's always a good thing.

Do you have private health insurance?

I'm asking because the allergy testing services in the country are soooooooo stretched out that it may be difficult to convince the doctor that she really needs to be tested, particularly when the first reaction was more than a year ago and she has not had any other problems with nuts ever since (it could have been the nuts or any other thing).

It took 18m for DS to be seen at an allergy clinic after his first reaction to peanuts, even when we had no doubt whatsoever that his reaction happened straight after touching a peanut, and that it was strong enough for it to be taken seriously.

I would avoid leaving your child with somebody who is not taking your worries about nuts seriously, no matter how unfounded they may be (if they were), it is not safe. DS is apparently ok with walnuts but a peanut is a REAL danger. The fact that they can tolerate some nuts doesn't mean they can tolerate all of them.