Me again, answering own question with the results of my experimental batch:
1. Substituted milled weetbix for whole wheat
2. Quantity should be halved - obviously these measurements make more than 2Lt capacity of the bowl
3. Date and Craisin mix is impossible to spread - I ended up mixing it with the flour/wheat/oats etc and spreading by hand
This still passed the taste test. I will post this in tips and tweaks too :-)
Cheers,
Kate