For large items I usually use parcel2go.com and choose from their quotes depending on pick up times and price. Sometimes they have collected the same day and delivered the following day. the last time I used them DHL collected within the hour. I've always found the service excellent but I don't always pick the same courier as they do vary. There are lots of comparison sites out there to choose from and the costs can vary but often they are cheaper than going direct to a provider I find.