No reason at all why it can't be used for personal consumption. No law prevents it.Two points. 1.Road kill is not supposed to enter the human food chain (someone will no doubt be able to quote the law verbatim, please). There are good hygiene reasons for this.
What you are not allowed to do is sell it or trsnsfer it in any way.
A shotgun is the best tool for the job, so no need to have HAD on your FAC to use a shotgun at the roadside.2. My Firearms Licensing department no longer put HAD on an FAC.You must tell the Police what you are about to do if a firearm is to be used and get an incident number.