I have my HG612 on TalkTalk in bridge mode with vlan 101 and my VMG8924 behind it set to IPOE. Now I did have my VMG8324 directly on and I believe it may well have been IPOE but I cant remember right now and I dont have it handy to check. You dont need any password or username with TalkTalk either. If required I can dig out my other router to check.
Stuart