I would be glad to see constructive discussion take place Nigel, I just don't think I would have a lot to contribute. Perhaps a longer tunnel is the compromise Gladman meant. Like your aged trout, I won't rise to the 'closed mind' jibe. I do have a view which is entirely my own and that is to stop building new roads (and tunnels) across our blighted land, most especially at places like Stonehenge.
Perhaps a tunnel under Avebury next!!