Well, I'm not really sure how it happened - one casual email has had a rather surprising result. I expected to go through months and months of fruitless enquiries but I seem to have paid a deposit (refundable if the BAER result is unsatisfactory) on a four week old baby:

we walked into the room they were in, and all the puppies were asleep except for one, who was sitting near the door looking up at us; and this was the only available bitch, the one the breeder had suggested we might be interested in. I bent down to stroke her face and she seized my finger and started sucking on it.
All being well she comes to us at the end of May. But she needs a name ...