If you have been playing 'youth' cricket in like youth cup matches and youth league matches and have scored bundles of runs or taken lots of wickets, then there will be someone taking note.
Example - Joe Bloggs has made 500 runs in 10 x under16 matches or taken 40 wickets in 10 x under 16 matches - then trust me someone from the youth set up will take a look or ask for you to participate with them. You can be the most technical player with no flaws in your technique, but this means nothing with no runs or wickets.
At your cricket club you will have a youth officer that will be able to ask Durham to take a look at you as you have been performing out of the ordinary