My son was diagnosed with austism at the age of 2, he is turning 4 in october coming and still doesn't talk but don't let that fool you, he is pretty canny for his age.
He had quick mobility skills, so I can't comment on that but other things sound pretty much like your son could be on the ASD spectrum. Don't be upset by it, I remb when my son was first diagnosed, I felt like I was the 'bad mummy' but infact, it's out of our hands and not our fault.
There are some simple things you can do to help your son, speak clearly to him and don't make verbal actions long, so instead of saying 'go sit over there, until i'm finished', say 'Bum on chair, mum finished, we go'. Try speaking in simple terms, ASD kids work well with visual aids and a lot of their frustration comes from not being able to communicate well. Have a google for PEC cards, really is worth it, although my son does not speak, he does talk via card signs.
Statementing can take a fair 6 months, so be prepared for a long old haul. I am not sure how other boroughs go through the process but in wokingham borough, all the help pulls together i.e. SEN tutor, speech therapist, social services, nurseries etc and they all write a report of your child's progress, which all gets put together and sent to the relevant social department, who compiles the application to go towards the statementing board. So be prepared to hear the worst about your child, it can hit you but you need to be honest to get the help a child needs.
Once you have a diagnosis, you can apply with a nursery for a free 10hrs a week and the nursery can also get a 1-to-1 plan for your child. I've had this with my son and he came on leaps and bounds! There are means out there, unfortunately with the current government changes, it's a little bit harder to get what you need but be strong and fight for it!
My son was rewarded his statement, plus 20hrs of teaching time at the local SEN school (it's like a dream come true for kids, that place lol). I worked hard over the last 18 months, researched alot, prepared myself, got involved with local ASD groups etc and it really does pay off. Remb that you are not alone, there is a lot out there for parents as well as kids with ASD

I opened a website a while back, with my personal experience, I need to add to it but might be helpful in showing you that there is a light at the end of the tunnel xx
http://www.dealingwithautism.co.uk/index.phpIf you need a chat, drop me a PM
