Hi PSYCOBFH,
The original letter gave no indication of the exact (or perceived) problem. It was put simply as an anomaly that needed investigation. Given that I had two months to get checked out I re assured myself it could'nt be too bad otherwise I would have been stopped from flying immedately.
During the consultation a comprehensive explanation of the results was given, it was very helpful.
I got the impression these guys would do all they could to help and that withdrawing a medical really is the last resort.
cheers