Word, I agree. Unless there has been a big change of emphasis, my impression was more 5-6, including at least one to the States and one who was realistically more RG.
There are swings and roundabouts with staying in London. Geographically you have not moved, but the learning environments are very different and obviously very much more international. There have always been some who find that Oxbridge colleges dont provide enough contrast from school and are a bit "small town".
Westminster seems to provide a great foundation, for University. Boys who might otherwise be quite retiring are used to presenting papers, organising things, seeking out additional opportunitites, taking part. So where ever you end up you are well placed to make the most of it.
Uilen, I am surprised that the pool of strong maths candidates has not grown over recent years. As standards of English improve, studying in the UK is becoming an increasingly feasible option for EU students. There has been a growth in sixth form colleges specialising in maths, whether catering for overseas students (like ones in Cardiff and Shropshire as well as London and Oxford/Cambridge) or the Kings Maths school in Central London. There has been a huge growth in British education as a product such as the Harrow International schools catering for the growing numbers of affluent people in places like Thailand and China or students from places like Russia taking up sixth form places in traditonal British boarding schools. Plus the numbers of expats actually living in London and educating their children here is increasing. Some of these have to be very good.
DS has found that the strength of the maths knowledge has been really useful. He is supposed to be taking an economics degree yet three out of his four first year courses are maths. The difference though between that and a maths degree is that maths is essentially a tool so he needs to be capable rather than gifted.