I use Pharmacy2U and am really happy with the service. I can get my medication faster than if I put my prescription in with my surgery. I have a phone app, or I can order online. It's really simple and I get notifications at each stage of the request, authorisation and despatch. They use Royal Mail.
My surgery is a prescribing surgery, so my only other option is to go to the surgery to put my prescription in, wait 7 days and then go and pick it up... so two car journeys and a longer wait.
The only downside is that they're constantly asking me to recommend them to others, which slightly drives me nuts. As it happens, other than my OH, this is the first time I have mentioned it.