I was at Bockmer livery stables, near Marlow, about 4 years ago, they had good turnout. Two floodlit schools and lunge pen. Also a small indoor.
Don't think they have a website but if you google them there should be contact number.
I would suggest you look at the boards at Tally Ho on Crouch Lane, that is how we found our yard.
I am in Holyport & know of several livery vacancies in the area, depends what you want, there are a lot of part/full yards around here & not so much DIY.
If you google Lakeside Farm they have vacancies & is a very nice yard. Also got Cresswell Farm, Mount Scippets, Gleniffer, Berkshire Riding Centre, Kimbers Farm (really nice yard) & there are a few others that I cant think of.
I wouldnt recommend Jennings/Snowball just my opinion!
When i lived in Maidenhead we kept our horses at Lee Farm, Pinkneys Green. That was about 3 years ago now so no idea what it is like now, it had good hacking, indoor and outdoor stables, outdoor arena and lunge pen
Shameful advertising by previous poster! Thought the place had been under 'new management' for a couple of years now so really can't blame it's current reputation on past issues! Although I believe it had been successful in the past?