If you know someone that might be interested in solar panels and they are in the York area you could get £100 for referring them if they go ahead!
There's a form you can download or you can fill in the details here...
www.coresolar.co.uk/refer-a-friend-for-solar-panels/
www.coresolar.co.uk/wp-content/uploads/2015/11/Referral-rewards-form.pdf?9e6010
Just make sure that they are happy for their details to be handed over!