I generally use collect+ http://www.collectplus.co.uk/ mainly because i can take my packages to the nearest collection point to send them which means i'm not sat at home all day waiting for a package to be collected, my nearest collection point is the corner shop 2 doors away. They don't ask what's in the package but just that it's not on the prohibited list, weapons and replica guns are on the list but i've sent a viking and received a tippmann A5 through them with no problem. Packages under 2kg, insured upto £50 and tracked for under a fiver seems reasonable to me.