Safe, kind, well schooled cob to hack in wonderful countryside

Nutmeg is a 14.2hh 15yo traditional coloured cob, kept on full livery at a lovely friendly yard in fabulous riding country just south of Guildford. She is the sweetest, gentlest mare, and totally unfazed by almost anything. She only wants to please, and doesn’t know how to be naughty! She is not a plod, though, and is well schooled and responsive to correct aids. I'm looking for a sensible, sympathetic adult rider to hack her out one day a week, preferably on a weekday, days flexible. Extra days are often available at no extra charge. You need to have experience of hacking a horse out alone, and be competent at walk, trot and canter. She would suit a nervous rider, as she tries so hard to please and is a real confidence giver, or an experienced rider who just wants a safe, steady hack in wonderful countryside. No complete novices, children or teenagers, please, and she has a weight limit of 10½ stone. I am looking for someone who will enjoy Nutmeg for what she is; she is willing and gives 110% every ride, but she is not a racehorse! No yard duties, but a financial contribution of £130 monthly is expected, and you must have your own personal accident insurance.