On the face of it...
2) A licence is a licence, and if such sets the limit at 1000m a new/extra/additional licence would be needed to go the other 200m.**
Ah yes, "destructive distillation" (The Lurgi Process, as was;for the production of 'Town Gas'*). At last I feel the benefits of an education amidst the coal fields.
1) I take this to mean that no extraction of oil/gas-bearing solids is to be attempted.
*The modern Lurgi-Ruhrgas Process...
https://en.wikipedia.org/wiki/Lurgi_process
The Town Gas process...
https://en.wikipedia.org/wiki/Town_gas
**
Might there not be a separate licence for each site?