As Variable Load says above, there are actually two schemes. Well three I think
A CPL sponsorship which does require a PPL(H) to apply - So its a small sponsorship from the PPL to the CPL for pilots on a modular course
There is the Bristow CPL Cadet scheme - The one advertised in that flyer above. The requirements are minimal and the application form asks if you have any previous flying experience
Finally, the Bristow Group LinkedIn page is also advertising an Instrument Rating sponsorship at Castle Air for those that have a CPL(H) already.
Good to see HP courses starting up again!!