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Yes you can, so long as the superior landlord agrees or the owner of the property.
Does that clarify?
It would sensible to have a written agreement in place. Yes, tax would be payable on rental income.
Does that cover everything today?
It's entirely up to you. Both have their advantages.
No you would not for a Lodger. I wouldn't be able to comment on whether it would be tax efficient for you. I would suggest that you consult a tax advisor on this point.
I do but this would have to posted as another question.
Sure, you will need to ensure that the property is safe and the lodger will not be injured. Furniture must comply with fire safety regulations and gas safety regulations also apply. You should also check their immigration status before renting a room.
You can have a local solicitor prepare one for you according to your needs.
I would not suggest using anything off the internet as they can be incorrect.
It's a pleasure.
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All the best.