I have two sons who in Grades 7 and 10 at the Chataigneraie site of the International School of Geneva - we just moved here in the summer from another international school.

The important thing to know is that the schools here are very heavily oversubscribed and we were "lucky" to get in having made an application in January. If you change into Grade 10, then there is the added complication of being the last to choose your options and therefore there may be a limited range of choices which may not suit you.

You may also know that the three sites are really quite different in terms of feel and you do need to visit to see this for yourself. Having visited the three sites, we had a definite no, a possible and a preferred choice.

You also need to consider the IB versus GCSE and A levels that your son may wish to study. The IB is a broad and demanding curriculum which some students are more suited to than others.

Finally, you speak of "affluent homogeneity" in UK boarding schools, but given the level of fees here, any mixing is more of nationalities and languages!

Good luck with your decision!