Hello!
I'm not from London, but I can help you.
I'm an electronics engineer with experience in embedded electronics: microcontrollers, sensors and displays. I also can drive Induction motors and DC motors (which will be useful in your project).
I can help you with manufacturing too. I know PCB manufacturing companies and soldering companies (Pick and Place, Wave soldering or even hand soldering).
I'm located in Bulgaria, but there is a cheap shipping company which can remove the location problem.
If you are interested please feel free to contact me.
Have a nice day!