Hi Mick,
I'm from Jarrow and my family are still round there but I live in Suffolk so I'm surrounded by flint!
Next time I come up (and that might not be for quite some time) I'll pm you and bring a load up with me. We can meet on the A1 somewhere round the A690 turn off.
Even if you get sorted in the short term I can stock you up well. Are there any special attributes you need the flint to have?