i have done my CBT im 16 been riding my 50cc for a month or so now. im wondering to go onto a 125cc do i have to take another test for a 125cc or can i go straight onto a 125cc with no test.

also for a full bike liscence how old do i have to be.
by the way im in the UK in england so give me the right answers if you can.
im sticking to bikes thats why im riding a 50cc and yes i know its not a big engine but i have to start somewhere.

thanks