Disposal of Body

is the remit of the executor: See revocation
Burial on Land Page 463
Burial in a garden; Death must be certified by a doctor or coroner and registered: Planning permission for one or two bodies is not required; more may constitute a change in use of land.

Although a body is treated as clinical waste, in practice the local authority can be asked to waive this requirement.

Sufficiently deep (put under a tree - woodland burial)
Be far enough away from a water course: See Environment Agency
Note value of land and future access to site may be long term concerns

Burial at Sea Page 478 (note 128) as follows:
Then: David A Smale (ed) Davies' law of Burial, Cremation and Exhumation 7th Edn, 2002

See Court of Protection Practice 2011 ISBN 978 1 84661 266 4 & ISSN 2040-2627