Thought I'd answer my own post, whilst it's still fresh, in case anyone searches for this next year.
The Ambrose exam 2010 consisted of the following:
Verbal reasoning - 45 minutes, 100 questions, not multi-choice. I saw a similar paper, and it was fairly different to the Chuckra papers, although many of the same types of questions were there. 100 questions in 45 mins sounds a lot, but a lot of the questions are multipart (eg you're given a table of information, and have to answer a number of questions on the info in that table). Quite a few multipart 'logic' type questions - eg ABCDE are five brothers, only A and E are married, Bd and E live in Scotland (the others in England), B&E work on a farm - Which married man lives in England?
Maths - 40 questions in 40 mins, multi-choice, SATS standard then an 'extension question' for those that finished in time - this year it was how many squares (of all the different possible sizes) are there on a chess board, and what is the rule to work out the number of squares on boards that are greater than 8x8. No idea whether/how this forms part of the marking, but presume it must.
English - 76 questions (according to my son, though obviously an unusual number, wonder if he forgot to turn over the last page!) of multi-choice 'vocabulary' questions. 30 minutes only, so they have to work quickly. Each sentence unrelated to the previous. On a similar paper, these start off very easy (The birthday ..... had six candles on it) but progress to a level quite challenging to adults (well this adult at least) such as "The sect's monastic tradition dictated that such .... required secluded penitence" (answer was infringements). Apparently they're not expected to finish/get the last ones.
Finally, there was a 20 minute creative writing test, carrying on from the start of a story provided.
I have been told they like to vary the format, so if this isn't how it is for 2011 then please accept my apologies!