Thank you very much Graham Metcalf and Richard Britton for your very helpful guidance which has been fruitful. The 1854 map has given me one of the fields (Dovecote) plus an aerial view and I am working on the others. Thank you, Richard, for the local contacts, which I shall endeavour to take up. I uncovered these field names, by the way, as a result of seeing Thomas Harrison's Will in which the fields were listed.