Glad it's revived from last year as its given me the chance to read through some good advice!

Keep meaning to stop using Royal Mail so much as some of their prices are extortionate, although they always deliver! - pun intended
My experiences from a few year's back mirror Duo's, where my company were let down by CityLink one too many times. Guys waiting at customer sites with the client for a "next-day" delivery that doesn't turn up. Some very embarrassing and frustrating moments before we moved to using DHL and some others who were all far more competent.
Thanks for the info and experiences anyway, very useful.