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In locating records relating to copyhold, the first thing is to work out which manor or manors may be involved. The boundaries of a manor were often not the same as that of the parish. The advanced search (or beta search) of the Manorial Documents Register allows searching on parish. For the parish of Lapley the search gives just one manor, named Lapley ...
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As is often the case, taking the time to write a question, seems to put me some way along the path to an answer.
Please feel free to provide a better answer but I found these useful references:
Staffordshire and Stoke on Trent Archive Service Guide to Sources: No. 7, Manorial Records:
LAPLEY & WHEATON ASTON
Rentals, c.1615-1861 LRO D(W)3222/180/...
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