We are in Cumbria, but not in the NP - so doesn't affect us here.
My mum lives in NYorks and half of the village is in the NP, and they have considerable restrictions on what changes can be made to the external appearance of buildings. (Similar to the lowest category of listed buildings I think.)
we did think of just changing the locks but thought "in for a penny"
it is a holiday let that we look after for a friend. he thought an el-cheapo-UPVC-jobby would do ..looks like he could be wrong.
thnaks for the link WW ... not easy to find out the answer.
I know that where my parents live they have huge restrictions on the fronts of their houses but are allowd alot more on the backs - so one house has changed the back windows but can't afford to double glaze the front ones as they have to be special ones that look like the old ones.
Lucy is a very bubbly lady; her menu blurb is always entertaining plus the food is gorgeous. I can't remember how many DCs she has but iirc they are all girls. the eldest was very poorly when she was little but is fine now - she must be in her early 20s.
thanks for email - i will give them a call tomorrow.