garnett said:Sorry - missed the thatch issue while writing the other bit.
Thatching styles and materials are very much down to local tradition. Most thatch is here in Devon and it is combed wheat reed. As you go across the country both materials and style change in to long straw. Post WW2 some conservationists preferred long straw so you actually got buildings changing.
In Devon we also have lots of soot blackened thatch. This is actual evidence that the building had an open fire before chimneys were introduced so the thatch is 500 years old or more.
There is also the issue of availability of wheat read. There won't be much available this year due to the rain.
To answer your question, legally we can't ask for betterment in an application. However if this building has a Norfolk water reed roof and they are proposing to put Polish water read or even African pampas grass on the roof then consent may well be required.
Our job is never black and white. With experience you realise that there are many shades of grey. That takes years to learn and at the moment that knowledge is disappearing in local government due to the cuts.
Good luck
Garnett
Just out of curiosity, what are your views in ridges? They seem to be getting more and more fancy and CO's seem to be letting people do it. And sawn/planed/treated timber rather than split hazel for instance, I see more and more roofs being done with B+Q off the shelf timber these days.