Riding the boundaries of Northumberland Blood Bikes area in a day

I'll be volunteering for Blood Bikes at some point in the near future.  Like many of the emergency medical support services they're a charity, relying on donations to provide the care that we hope that we never have to rely on.
For those of you that ride, this will be a bit of an Iron Butt event.  You reach a point where things start hurting!  I did just over 5 hours a few days ago which was starting to become uncomfortable and this will go a fair way beyond that.

A small extract from the event text: "This event  will help to keep this volunteer service on the road.  Running costs alone are around £7,000 per month. Your donation will help to fuel our vehicles which carry vital supplies to the local hospitals in the North of England and replenish blood supplies, 365 days a year, to the fleet of Air ambulances serving the North East and Cumbria. (this is known as the B.O.B run (Blood On Board) and was the brain child of Dr Rachel Hawes to help save lives when time is a matter of life and death. The route takes riders to the furthest points of the Northumbria Blood Bikes operational area that they will cover many times during the year (the total area covered by our team is (approximately 3,317 Sq miles).
The locations visited will showcase some of the best areas Northumberland, Durham, and Upper Teesdale have to offer - wild spectacular Landscapes, Moor and Coast."