DS goes to a prep school (up to 13) and has a satisfactory (not exceptional) record in placing children at the top london day and boarding schools e.g. Westminster, St. Pauls, Eton. We are however considering whether DS should take the 7+ entrance exam next year for Westminster Under and Colet Court (if he doesn't get a place, we carry on with his current school). We think he is ready for those tests (and even though the school does not prepare him) and can work with him over the course of the year. We have however been 'strongly' advised by some people that given DS goes to a Prep school - WUS and Colet Court will not 'consider' him for the entrance. This is because his school goes to 13 and they would much prefer a candidate from a 7+ school. I have not been given the reasons for this - but simply that as the 'upper schools' (i.e. Wesminster and St. Pauls) have a good relationship with his Prep school - they would not want to affect this by taking one of their students at 7+.
My own personal view is that these schools will take a candidate they like, irrespective of the school or the context. Just wondering if any mumsnetters with experience of this can verify this - do any of you have children who may have applied and been successful from a prep school to the prep department of WUS and Colet Court?