I've been thinking about this, do you really want to do this? It's a hike and a half for both of you to the middle of the country. Neither of you will be able to pre bait or keep bait trickling in with any regularity, the fuel costs will be prohibitive, the environmental impact is gonna hurt too.
I did the trip from Scunny to Stamford, it took nearly 2hours evrey time, it affected my fishing, I couldn't concentrate on a baiting campaign etc.
I'm sure you and your brother are close and I can understand why you want to fish together. Why not look for a lake that's near one of you? F'rinstance, near London you could join a Colne Valley syndi etc or find a syndi near Scarborough or in North Yorks and both join that. That way there will be one of you near the lake all the time, the local angler can carry on putting bait in, keeping in touch with what is happening, maybe getting down for the odd overnighter. Then the distant angler can come up/down accordingly.
Work it right and you can leave some gear (rods, end tackle and alarms etc) with the local angler, get a double bivvy so you don't have to carry any gear up and down the country. Maybe look at using the train if it's just one person travelling?
It makes more sense to me to do it that way.