Just thought I'd post these in case anyone is off to Chessington tomorrow.
half price entry
mother and toddler discount
The 1/2 price is valid for both adult and child tickets and pretty much everyday through to November (although some exclusions in July)
The mother and toddler is restricted weekdays so check the voucher. I have used both successfully and can recommend Chessington for a 1.5 and a 2.5 yr old .