Hey Richmond - yep: done it, been there, got the cap. As a London day-school product myself I was inherently sceptical of boarding at 8 and just felt it wasn't "modern" and didn't take sufficient account of significance of family life and support in the ever-more challenging environment that our children's generation have to thrive in. DH was himself sent off to board at 7 and was a strong proponent of boarding at 8 for DSs and at 11 for DD. The Ludgrove experience converted me I have to admit - to the point that I would now start from a default position of "...if you have the resources you should consider boarding as the best choice..." I feel slightly weird about this.
We share some experience in common. DS1 was also an early riser (04:45-05:30) from 4yo although from 6 this thankfully gestated into reading quietly in the sitting room without apparent harm, tiredness or other issues. Strangely, as soon as he got to Ludgrove he confirms he moved to 07:15 rising within 48hrs. Make of this what you will!
I had always thought DS1 was a bit inclined to worry and rather quiet/shy/diffident/academic/booky. In the weeks before departure to Ludgrove I wound myself in to a complete state about contact protocols (particularly as Ludgrove is strict about contact in first half term and still "strict" in its interpretation of "boarding", no flexi-weekends etc.) DH consistently said "don't jinx this, he'll take to it like a duck to water" a prospect I found even more worrying than thinking about his potential homesickness.
Well....what do you know? My shy, bookish young chap went away and hardly turned to wave us off that first drop-off and within three weeks was the absolute image of the nonchalant boarder. That's not universal. Three of DS1's year didn't cope so well: one had very distant parents and no family experience of boarding, but another had geographically close parents who had themselves both boarded and was a fourth generation Ludgrover... but who was almost inconsolable for the whole first term. The school reacted with really impressive and supportive caring and a simply "kind" routine that gradually worked for the boy and for his bewildered parents too. They didn't try to ignore it, just very calmly showed themselves to be a very real "family." He has become probably the pre-eminent star of his year.
So, the reaction to separation is not predictable. The way Ludgrove deals with new joiners (not just in the VIs) diminishes the chances of serious upset and naturally supports coping and can do so even when boys suffer real separation issues. Beneath Ludgrove's "trad" exterior there's a very effective structure...I think it's as good as it could get.
Nothing really prepares you though for the first few times DS1 can be heard loudly telling his Div Mistress that he'd "rather not" (talk to you on the phone) "right now" as he's just off for a round of golf/play cricket in the nets/off to camps, whatever. Or DH's amused look of "told you so" either.