Hi, Jonathan/Sarah...
Hope you don't mind me butting in like this - but just wanted to say that I also teach in the UK secondary school and and very interested in how Moodle "talks" to SIMS/Assessment Manager.
I'm sure there are loads of colleagues out there in a similar position who love Moodling but who are realising that Moodle doesn't perhaps boast (or claim!) the same degree of integration with MIS software as other commercial VLE/MLE/Learning Platfoms.
It would be good to use these forums to share ideas/best practice.
Mark