We can still get some Proline spares as they are shared with other brands but, only where we can get the information to be able to determine what parts were used. However it should be noted that many spares are completely obsolete.
The reason being that Proline was a brand name owned and operated by Comet. Of course Comet ceased trading and, when that happened, pretty much all support for Proline died along with it.
We can only tell what is or isn't still available by searching for you.