Sir William Perkins's School is not worth paying the yearly school fees. My child spent a very short time of her school life at the school before we decided to take her out. Many things that were of concern were brought to our attention at a very early stage.
I would urge you to read a few reviews before considering applying and paying for the school - not just from mum's net. Neither the governing body nor the head has your daughter's best interest at heart. For them it is your £20,000 that is the most important and as soon as they have the money, you feel that you can't let go. The school will do more mental health damage to your daughter than any good - luckily we got out of there very quickly but my daughter is still finding it difficult to process what has happened to her there and I would like to save you the headache and heart break.
One lesson I've learnt, albeit a bit too late, is to use the internet to read reviews, ask questions and most importantly, go with your 6th sense.