My son had lessons with Sandra from Horizon and he past his test in August this is what he posted on here at the time:
For those looking for a driving school, I would like to heavily recommend Horizon School of Motoring. I passed comfortably, despite having a gap of 3 months without any lessons due to personal injury. I also completed my final year at University during the same time period I learnt to drive and despite this added stress I found each and every lesson enjoyable and progressed very well. My instructor was Sandra, who I found to be incredibly friendly, laid back and a great instructor, a real credit to the organisation.
I couldn’t recommend this driving school any higher, particularly for those of you who have never been behind the wheel of a car before.
His user name is Yorkminster if you want to search for the thread.
My youngest son is currently having lessons with Sandra as well and he will be taking his test next month.