Before you designate your home as your normal place of work take some professional advice.
Issues such as change of use - planning issues, rates, insurance etc etc etc can raise their head.
Your neighbours may not like the idea of hoards of people coming round seeking groundschool and the extra traffic parking etc etc etc.
Your normal place of work would be somewhere that you can actually do your normal work would it not?
Can you do that at home?
It can be simpler and have less possible consequences to designate your closest aerodrome as your "normal place of work" and only get into mileage allowances if you travel a greather distance than this from your home office.