if the kit is hired from someone (as long as they didnt know it would be used in these circumstances), the police are unlikely to take it, as it just causes them hassle with the hire companies.

not true

makes no odds whatsoever if the rig is hired or not

except that if it’s confiscated the hire company will probably recoup their losses from you

and the police may charge the rental company if they believe they knew it was going to be used in an illegal way