In terms of marking she said 90% of the papers are marked by the teacher and two sent off for validation ?
Oh how I wish that was true! I also teach this but am with AQA. The sample size is 20 for all exam boards. So if you only have a class of 20 or less, all of them will have to be sent off to be validated. If you have a class size of more than that, then they will issue you with the 20 names they want, after you have sent off your results. Obviously though, this is probably a moot point and likely we won't have to send anything off. This debacle has caused a huge amount of damage to this already niche subject 
I've read the Consultation and responded (by the way, so can parents, so send your response too on the link on the first page!) and their only options state that the two exams would be worth 50% each, if the NEA was to not count, so it's only fingers crossed at this stage that one paper would have more weighting over another.