At Christmas I sent parcels to USA for my daughter and family, I have discovered in the past with the Post Office that over a certain weight the prices shoots up quite considerably. So I tried Parcels2go which lists lots of different companies and their services, so it is easy to compare. I had 3 parcels to post of different shapes and weights. Each parcel individually would have cost approx £38, but they do a multiple offer and it cost me £68 for the three of them. Parcels were collected from my front door, and arrived with my daughter 3 days later. The Royal Mail appears on the list, plus all the big names and some I have never heard of.
Yesterday my husband had a parcel to post to UK, we weighed and measured it, due to be collected between 9 and 5.30 today, was collected at 8.45. Was again cheaper than Royal Mail and did not have to queue and get a nasty shock at the price.
It is just good to have options.
Even with postage stamps I order them with my Asda shop and get them delivered, just saves another trip out at the moment.