Thank you for the responses. Much appreciated.
I already have L2TP configured for IPv4 and IPv6 and both working as expected.
I was asked initially if I could configure PPPTP (Which I guess is now PPTP) for user who want a secure connection that are not DSL for if they require a VPN. I noticed some options via the services stanza but, as you rightly mentioned, I could only find documentation for SE and SRX hence my question.
I will go back to the customer and ask what they require exactly as there may have been some mis-communication or the wrong perception of what they actually want.