Hi All! Thank you sooooo much for your comments. Most insightful! Sorry it has taken me this long to respond but as indicated in my name, I am lazy!
We have now finally visited the school. We were shown round the school by an English teacher who was very impressive but obviously had a bias towards English as we spent more time in the English building than the Science facilities. We were shown around with 5 other families and so it was not easy to ask too many questions but overall impression is favourable.
We were most impressed by the teaching style/methods (from observing lessons and asking questions), if what we were told were true. Very informal teacher/boys relationship to encourage the boys to really speak out their own thoughts and to participate. Very close to university tutorial style is the impression we got. However, I am slightly unsure about the compulsory requirement to do 4 A levels.
We were not shown the old or the old old gym or any sports facilites but we were told about the newly acquired gym and were given the chance to ask all the sports questions we wanted to ask. We got the impressions that, although sports facilities are not the best, there are enough on offers for everyone. The really sporty ones can do lots but there are enough of other non-mainstream sports on offer for the less sporty ones.
Although we were impressed by the old buildings, I was less impressed by the size of some of the classrooms or by the fact that one have to walk up 3 flights of stairs to get to some of the classrooms. I do not particular like the fact that the boys need to leave the main buildings and cross roads to get to some facilities although I was reassured that no one has ever been run over by a car!
DH is convinced that this is the right school for DS. I am still doing my homework. Thanks again for all your comments. Most useful.