Rapha, nice but a bit pricey?

Yes, only whilst store is open.

You can join online and then access hire after that.

This is why I joined the RCC, you've got a high chance of their being a Raphé near to where you are going, the bikes are high spec (although the one I had most recently was in severe need of a fresh bottom bracket, much to the ongoing amusement of everyone I was riding with as it creaked like a galleon under full sail) and cheap. The three day thing is fine for a weekend. Only problem is that they've got (as far as I can tell) two of each size, and often one of them is broken (or at least Boulder have had only one L available this year), but booking far enough in advance gets round this.