Spatchcock Chicken with Lemon & Rosemary

I cheated; I bought chicken pieces, as I find the whole spatchcocking business rather daunting. I'm sure it's not but if I can buy it already done then I'm going to go the easy (lazy) route. The marinade was simple to prepare, and I had homegrown rosemary in abundance- it's the only herb that has resisted the cold spell we've been having. The chicken was very flavourful and went very well with minty new potatoes and cheesy leeks- a childhood favourite of mine.