Hi there, you do not need more that your UK passport to buy a real state propiety in Spain.
No driver licence, no insurance number needed.
The notario will ask you for your pasport and thats will be all.
Another thing you have to know is that according law, all real state owners in spain, must make a tax insurance in the spanish tax office each year for the whole incomes you declare all wide word. It does not mean you have to pay taxes, (taxes paid in UK are deductibles, but you will have to make the personal tax declaration in Spain IRPF
José M Spanish atorney
Have a good day
Sure, no problem with that
He / she could send you the contract and you answer him/her back with your pasport scaned and the contrcat will be perfectly legal. You will have in person to sign at the notaria
Even you could make a power of atorney for this matter and send it o him and he could buy it for you and then you do not need even to come