Hello Peter,
Thanks for your post. Its a bit complicated to be honest! You are probably best e-mailing the reserve at lakenheath@rspb.org.uk; and we will give you some more information.
In the meantime, we will always put the word out about rare sightings on the reserve via the reserve blog and/ or on the RSPB Suffolk Facebook page as long as they are on parts of the reserve that are open to the public.
Additionally, scarce bird sightings are published on Bird Guides at www.birdguuides.com;
Many thanks,
David