UK Property Law
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1. In order to lay legal claim to the house, based on your occupation, you would need to be able to show that you hadn't been paying rent, whilst occupying it for the last 12 years, exclusively, without allowing anyone you didn't want to access. Here, as you were paying rent to the landlord, I am afraid your claim for squatter's rights or adverse possession would fail, as each time you paid rent, you were acknowledging your landlord's title to the land. Something which is inconsistent with you owning it.
2. The other things, I am sure you don't need to be told, that a promise to leave something to someone is a will is not legally enforceable. People say these things all the time and the law only recognises a will as being valid. In order that a transfer to you by way of gift would have been valid, there would have to have been something in writing transferring the property over to you. A mere puff from a landlord is not sufficient. Not everyone is honest and keeps all promises they made. The landlord here simply lead you astray.