Info sent in by Graham Rees (who is unable to post on the blog direct at present) with a useful link -
M.P.Harris conducted cross fostering experiments on Skokholm by swapping eggs between HG and LB-bG nests. His review of hybrids between these species was published in Bird Study
http://www.tandfonline.com/doi/pdf/10.1080/00063657809476590Subsequently there have been occasional entries in Pembrokeshire Bird Reports. Mike Betts has some photographs of hybrids at Skokholm which might be of interest if he can be contacted. Hope this helps,Graham
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