The quick version: Can I get 2 friends into the LHR lounge during a long layover?

The long version: My son and I will be traveling business class, our 2 friends will be traveling in economy (Tango or Flex, I'm not sure which or whether it matters). I have E35K status and an AMEX AeroplanPlus Platinum card.

Does any combination of these allow me to get one or both of them into the lounge (either free or by paying something)?

(To be clear, I don't mean the LHR arrivals lounge, but the departures lounge on our way back to YYZ.)