Thanks for reply.
Joint tenants means the property passes automatically, through survivorship, to the surviving owner (and hence means the deceased's half share does NOT form part of the deceased's Estate).
Tenants in common means you both own a separate 50% share each, which 50% passes in accordance with each owner's respective Wills, and DOES form part of each owner's Estate.
Therefore, if you do hold the Property as Joint tenants, you will not require Probate, as your Father's half share in the house is not included in his Estate. I am guessing that you do indeed hold it in thi smanner, but you would need to check. This can be done by asking a local Solicitor to look at your Deeds, or if you have a copy of the Deeds to hand, you can see which way you are holding the property- basically, if there is a Restriction in the Proprietorship Register stating "No disposition by a sole owner...without an Order of the Court, then it means you were holding as Tenants in common. If there is no Restriction, it means you were holding it as Joint tenants.
If you hold it as Tenants in common, then strictly speaking, you will need Probate, but if the other Banks etc have already confirmed to you that they do not require sight of the Probate, then you can get away without obtaining Probate, but your Solicitor will need to apply to the Land Registry to remove the above mentioned Restriction.
I hope this assists and answers your question.