Contractual licences; proprietary estoppel
A reasonable notice period can be implied into a revocable contractual licence that does not specify the notice period to be given. There is no estoppel where the landowner has done nothing (whether by words, conduct or a ‘silent’ assurance) to represent that a claimant will have some interest in the land (Canadian Pacific Railway Company v The King).
Estoppel by convention
‘When the parties have acted in the transaction on the agreed assumption that a given statement of facts is to be assumed between them as true, then as regards that transaction each will be estopped as against the other from questioning the truth of the statement of facts so assumed.’ (Spencer Bower and Turner, Estoppel by Representation, 3rd ed (1977) cited with approval in Amalgamated Investment & Property Co Ltd (In Liquidation) v Texas Commercial Bank Ltd per Brandon LJ).
Promissory estoppel
The promise in promissory estoppel must be precise, clear, unambiguous (Chekiang First Bank Ltd v Sino Legend International Enterprise Ltd).
Proprietary estoppel
The equity arising from proprietary estoppel can bind subsequent volunteers (Chin Lan Hong v Cheung Poh Choo).
Waiver by estoppel: promissory estoppel
A party to a contract who represents to another that he will not insist on strict compliance with a term (making time of the essence for example) can lose the right to enforce that term when the other party relies on the representation to his detriment (European Asia (Hong Kong) Investment Ltd v Wong Shun On Anthony).
Hong Kong Land Law Blog 
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