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Some years ago I purchased a freehold mooring in St Olaves for peanuts, with the intention of buying the one adjacent and renewing both quay headings as one: mine wasn't that bad but the neighbour wanted to get rid of his because his quay heading was poor and physically lower than mine. The hoops that the BA expected me as a private individual to jump through were unbelievable, especially compared to what “the Big Three” seem to be able to get away with. If I recall correctly, amongst other things I couldn't use material dredged from my own mooring as back-fill, and there was a requirement impossible to meet concerning earth transported from the site (or to, I really can't remember which).
Anyway, to cut a long story short it really wasn't worth the faff and I sold the plot on for what I'd paid for it, plus a couple of grand to cover Agent's and legal fees.
The BA suggest that we may need to apply to the MMO/Environment Agency/River Licence for permission. When you check it out with the various agencies then in our case we had to. If you live beside a designated river then you definitely have to apply to the MMO.