Hi Pauline,
When it comes to wills a solicitor has to be sure
1. The person making the will has testamentary capacity, and
2. They are not under any undue influence
At the moment there are no hard and fast rules as to how to ensure this and solicitors are still allowed to use their experience and common sense.
Personally I would not ask a spouse to step out of the room unless I was concerned either that the person did not understand what was going on, or the instructions were out of the ordinary. Ordinary instructions for example would be everything to survivng spouse and then to children of both parties. Out of the ordinary might be everything to children of one spouse. Nothing necessarily wrong with that, but I would need to make sure that was really what they wanted, and why.
With the new LPA there are definite rules for the Certificate Provider; such as the attorney must not be present and you have to try and discuss it without anyone else present.
It sounds as though your solicitor is doing it by the book, and can't be criticised for that.
I hope Jack is more relaxed when you come back from holiday and you can get things sorted.
On the question of severance of joint tenancy, yes a joint tenancy can be severed by one party serving a notice of severance on the other. Does it need to be registered at the Land Registry? No, if the property is unregistered (and there are still a great number of unregistered properties). If the property is registered, it's not an absolute requirement. If there is evidence of severance, such as a receipted notice, that will be sufficient.