I found an auto electrician not too far away from me, I dropped it off to them & It cost me £300 in the end, they struggled to find the parts but its like new now so im happy enough.
Theres lots of places on the internet that sell & recondition alternators if you google, it may be cheaper elsewhere, I was just keen to get the car back working asap.
Yeah, having a spare would be a good thing, if you never use it you can sell it when you sell the car.