Hate to be a pain, but just incase anyone reading this is confused, hope the following helps. It is taken verbatim from the letter that NATS sent me.
"The aptitude tests are followed by a multiple choice motivation and interest paper. The questions are drawn from the enclosed (out of date!) booklet please ensure that you read this booklet thoroughly as along with the aptitude tests, it is an important part of the selection. It is a timed test lasting 18 minutes."
Having read the booklet, I can say that there is no information about NATS new ownership and there is no info on NERC either. It is therefore safe to assume that the exam questions that are drawn from the booklet do not ask about NATS new ownership, nor does the exam ask about NERC. This is because it is based on the information in the booklet and there is no information in the booklet about NERC or NATS new ownership. The exam is multiple choice as stated above, therefore the answers are there to choose from. The answers are also based on the information contained in the booklet. You will not be asked any other questions on the selection day. The day consists of the exams and tests that are detailed in the letter that NATS send you. No surprises, no trick questions.
Hope this answers the original question.
[ 10 February 2002: Message edited by: WAIF-er ]</p>