I wouldnt bother with Dingle Pool if I were you the claims of fish weights there are vastly over estimated, you only need look at their website ..its a joke! The farmer hasnt got a clue either and even told me one day that the reason he banned hemp is that if fish eat it their mouths dont heal from the hooks!!!
Top Barn was a quiet fishery a few years a go and has got some nice fish in the lake by the road but now appears to be flooded by the masses.
There are a few pools not far away that are worth a look though!
I;ve carp fished round Worcester for over 25 years and the sad fact is that if its a realistic chance of a real 30 (not one thats been weighed wrong or dreamt up) you have to travel.
Or you could try the rivers......