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Hi, on the basis that this lady is not on the Deeds, which I trust she is not, you do have the authority to ask her to leave. However, if she does not go freely, you would have to issue Court proceedings to evict her! In practice, it would be far easier and cheaper for you to notify the Housing Association of her "illegal" occupation of the property, and let them take action to ask her to leave. Under the terms of your Uncle's Lease, there will be a condition that no-one else should reside in the property.
I hope it does not come to this and I'm sure if you explain to her that she has no legal right to reside there, then she will move out.
I hope this assists. If so, I would be grateful if you could rate my answer (top right of your screen).
Kind Regards Al
Thanks. I would be grateful if could you rate my answer.
Good Luck! AL