Thanks owensyummymummy, I'd be really interested to hear what they say. If you can, let us know.
I am really surprised with their sales and marketing strategy. I would have expected that they would be keen to retain current loyal customers by offering the seat unit upgrade immediately (as frankly I can't quite work out who will need it as an upgrade in 4-5 months time, as most babies in a Quinny Zapp will be old enough to sit up in the current seat by then). Retaining customers convinced of a product's benefits is frankly easier than 'swtiching in' new customers. And good word of mouth marketing is very valuable which they obviously are aware of since they are using the Quinnycasters idea - I would apply but since I am completely new to forums etc. (never used facebook etc.) I wouldn't be much good to them!). So am very confused as to their strategy, and as you can tell very frustrated as I can't find anything else that does what I need - my main issue being that having hurt my back I can no longer remove the car seat with baby in from the frame.