Certain members of the nobility have been employing "gardeners" to fly their helicopters with PPLs for years. This doesn't necessarily make it right, but I'm sure they would have spent a lot of money on legal advice otherwise they wouldn't do it.
Having said that, it's too much trouble to pick out the legal niceties at your stage of the game - you must be able to *prove* your passengers were employees/relatives of the owner, you didn't get paid, etc, etc. The part-time bit doesn't help, either, and makes it all a bit smokey. The aforementioned gardeners would have been supported by their employers, but would you?
cheers
Phil