I've read about the traffic with London being a nightmare the last time I was there in about '95, hence my considering Dublin as a point of entry. I read a report awhile back that UK is the most heavily surveiled nation in the world. It is my intention to stay as much as possible on secondary roads, so I have much planning to do.
Jerry, thanks for the bike rental information. That might be the way to go. I also found a place SW of London that pics the renter up at the airport and provides transport for the return flight.