Welcome to being a custodian of history . Totally agree with other advice join the Listed Property Owners Club , & contact local Council heritage officer . Both have a fountain of knowledge & extremely helpful who will guide you in what you need .
Historic England really only interested in Grade 1 grade 2 * buildings .
If you need a building surveyor there are specialists in listed building , & do your homework on work builders & renovators so they have the right skills . As if it is completed wrong , it would have to be corrected.
We have recently bought a grade 2 listed building , which is a vicarage boundary to church grounds - beware if you need to put scaffolding up on church grounds - you have to go through church faculty of DACS ( as not linked with Council Planning , has there own Ecclesiastical planning DACS ) . This can take up to 6 mths to be ratified & a lot of red tape.