i agree with smfc's post. Id have am nap between hours of 9am and 10.30am (an hour ish) and try making his afterrnoon nap earlier than 3 but say around 1pm to 3 ish (1 1/2 to 2 hours is good at this age for pm nap) then hopefully he wont nap past 3pm and u can try bedtime a little earlier and see whats happens.
Thats the routine i had my previous charges in at 10 mths (twins) and they woke at 7ish in the morn. They did wake on occasion like most babies (teeth etc) but usually slept thru and iv established my new charge in same routine and he doing well with it but he just six mths and still sometimes wakes wanting bottle or because of teeth sometimes usually around 1am but will then go through till 7 ish also.
Suggestion: is you're child in night nappies to sleep?? some babies are v sensitive to wet skin. This happend with the twins i looked after and me and thier mum put them into night nappies as a try out and I think it helped
Hope may help, good luck in you're try outs