Does removing a propshaft count as a modification?
Yes because it's changing the vehicle from the manufacturers original factory spec of being a full time 4x4.
Fitting a tow bar, roof rack, tinted rear windows, side runners, winch, roof mounted lights, bigger wheels, tuning chips, larger fool tank, mud guards, nudge bar... are all modifications. Insurance companies demand they're listed or it may cause them to back out of insuring you if they find out at a later date. Most insurance companies will accept them if they're manufacturer fitted when the vehicle were built. If they were added by the selling garage or owner at a later date then they're considered different.
The AA for eggsample int too keen on the mud guards I fitted. I bought them from a LR main dealer and fitted them meself. They confirmed if LR had fitted them when it were built ont track the insurance wouldn't go up. I fitted them so insurance is higher and they wouldn't cover them in the event of a claim. So I'm not with them anymore. They're a special kind of stooooopid.
Items like trackers, additional alarms, steering wheel locks etc go under the heading of eggstra security. So they don't mind those being fitted but still want to know about them. But mud guards are a huge concern to the AA. I wonder if they fit them to their breakdown vans.
I can confirm all me propshafts are fitted and working.