Do i have to declare that i have put alloys on my car, or is it something i dont have to declare? Also, what other possible modifications do i have to declare?

In short, yes. You have to declare anything that wasnt on the car when it left the factory....

^^^ true however depending which company i told mine that my car has alloys none standard interior and they just said as long as its cosmetic it doesnt matter and didnt increase at all... however if i were to lower my car or any performance mods at all would have to be declared and would increase premium... just ring them and see what they say =] "honesty is the best policy" haha

True - You with quinn by any chance matty?

I'm with adrian flux, anyone had experience with them?

Well if you ring them and say I'm looking to mod my car they say ok we'll send you some paperwork and you fill out all the mods you've done or are planning and send it back to us u should be fine! Adrian flux are quite good at realising modded cars arnt dangerous cars but not so good at calling you back for a quote! Lol

True - You with quinn by any chance matty?

that i am my friend =] they are really helpfull but iv heard bad things about them and they still refusing to pay my mate out for his corsa :\ lol bad times but they are pretty good I'm sticking with them untill i get older =]

Reminds me, I need to give Quinn some stick because I'm getting ripped £125 a month when it should only cost £80...