Always a good place to start:
https://www.autotrader.co.uk/car-sea...-Design&page=2
Nearest I can see is a 12 Plate done 74000 miles. Yours is a year older, but lower lower mileage, so maybe around £7000 as a retrail price? Having said that, there is a SE Lux on a 62 plate with 47000 miles at £7000....
I'd personally say start it at £7000 for a week, then reduce to £6500 if you don't get any nibbles....
... just noticed all the ones I've referenced above are "trade" sellers, so you'd assume some kind of warranty, etc, so worth bearing in mind when you're pricing yours.