It sounds like you got a good deal but i have to say Derby house has some very....mixed...reviews on the horsey forums! in respect of apparently constantly saying items are in stock and then people waiting months to get either the item or a refund.....I much prefer Equestrian clearance as their feedback is pretty well 100% positive. Have had good dealings with them personally.
Not trying to put anyone off from using DH but a lot of peeps eg on horse and hound forum haven't been having much fun with them recentlyhttp://www.horseandhound.co.uk/forums/showthread.php?t=590650&highlight=Derby+house