Thank you, I suggest that you send them a message and don't use their email. Send your message via specific case enquiry that goes directly to London office. Write in your email that you got DM on (date) and still haven't received the PPR and you are worried because you need to plan your travel. Also if your medical will expire soon, mention that as well.Congratulations!
I'm still waiting, 3 months now! Hopefully mine follows soon too!
I sent them the webform on 21st I think, they received it on 24th and I got PPR a couple days after
Stay strong, you will get it soon