We went in July & it was fab & just realised that they gave us a half price voucher for up to 4 people using the train in September or October. I don't know anyone who is likely to use it so its going free to anyone who wants it. The train normally costs either £21 or £24 so its well worth having.
I don't really want to post my email address on here so if you want it perhaps you could post yours I'll email you and then you can send your address. ( If there is an easier way of getting in touch do let me know !)