I'm doing the full distance in Henley this year and went and looked at the course last weekend. The road surface isn't great but they are touting it as being one of the faster bike courses for UK Ironmen - Howe Hill is the only real climb and it's over before you know it.
Focussing on half distance sounds reasnable enough and if you can build some speed then it should be possible to carry it through to a strong full distance performance. I'm not sure what courses are considered fast, but I enjoyed both Balla and Cowman, and Helvellyn/Wasdale are awesome events.
I'm doing the full distance in Henley this year and went and looked at the course last weekend. The road surface isn't great but they are touting it as being one of the faster bike courses for UK Ironmen - Howe Hill is the only real climb and it's over before you know it.
Focussing on half distance sounds reasnable enough and if you can build some speed then it should be possible to carry it through to a strong full distance performance. I'm not sure what courses are considered fast, but I enjoyed both Balla and Cowman, and Helvellyn/Wasdale are awesome events.