A doddish person is one that has an affinity for children, or a child under the national age of consent.
"Oi steve you know that james bloke?"
"Yes mate, the doddish one init"
"Yeh he got 25 years for noncery"
"Mad ting"
Dodding is the act of noncing/preying on a child, under the age of concent
"Oi steve"
"Yes mate"
"Can you stop dodding on the kids for fucks sake?"
"No suck your mum"