Good luck with the move back to Blighty!
I have two girls at Tormead (one in the senior school and another in the junior school) plus a son starting in Yr 3 at Lanesborough in September.
We have been very impressed by Mrs Foord’s changes to Tormead since 2010 when she took over the headship. She reduced the number of places in each year to ensure that the school’s USP is as a more nurturing environment, whilst also maintaining a reasonable, yet undeniably more diverse range of academic ability than at Guildford High School. Whilst the first cohort of girls selected under her headship have yet to take their A Levels (2017), this year's Oxbridge offers augur well.
Tormead fosters a "give it a go" attitude in its girls without them feeling that they need to "ace" something from the off - which, I think, helps them develop perseverance and resilience for the future. There is a tendency for some other Guildford girls' schools to micro-manage the examination process in an attempt to eradicate all risk, which I do not believe best prepares their girls for adult life.
We also prefer the school's central Guildford location which allows the older girls to develop a greater sense of independence with many girls (yr 7 and above) travelling to school by train. Whilst St Cats's Bramley location and rolling fields are idyllic, IMO the school feels like a throwback to a Malory-Towers like era. Girls are ferried to the door by parents or coaches and, during the school day, have little opportunity to experience anything much beyond the school gates independently.
We sat DS for Lanesborough, Cranmore (now mixed) and Aldro. DH and I both liked Aldro's new headmaster and the school itself. However it remains very much geared towards sending boys to the traditional public boarding schools at 13 whilst our preference is for DS to go to the Royal Grammar School (RGS, Guildford) at 11. Lanesborough is the prep department for RGS but a place in the senior school is by no means guaranteed.
Cranmore was our backup for Lanesborough but, had DS not got the offer from Lanesborough, we were also considering leaving DS in the state sector a little longer. Cranmore is a very sporty school and DS is not. Our feeling is that Lanesborough will nurture him with its lego and astronomy clubs and he might even get into a C or D football team, whilst at Cranmore he might just get pigeonholed as a nerd! You may, however, struggle to get your son into Yr 5/6 at Lanesborough as occasional places are rare. Cranmore or Aldro may therefore be better able to accommodate him and prepare him for either 11+ or 13+.
You can really only judge whether a school is right for your child by visiting it yourself, looking its headmaster/mistress in the eye and considering whether you would like your offspring to turn out like those pupils giving you the guided tour!
I hope that this is helpful and good luck!