Saz, there are several specialists that are listed on the UK's MPD support website. Not sure where you are in SW England but this doc is in Bournemouth and is an MPD specialist.
Dr DG Oscier
Consultant Haematologist
The Royal Bournemouth Hospital
Castle Lane East
Bournemouth BH7 7D
http://www.mpd-support.co.uk/support-doctors.htm This is the link to the site and the doctors.
Take care. Sue