Peculiar, I ticked the box and bounced the router. But while MRU has now jumped to 1500, MTU is still at 1492.

Code:
Dec 30 16:39:13 newclueless radius-auth: BBEU******** BT Accept ************* ************* ****** a.gormless LCP-restart txrate=24000000bps linerate=27451000/1000 MTU=1492 
Dec 30 16:39:17 newclueless radius-acct: BBEU******** Start ****** ************* MRU=1500 linerate=24000000/1000


Compared to one of my ordinary ADSL2+ lines using PPPoA

Code:
Dec 28 14:07:11 newclueless radius-auth: BBEU******** BT Accept ************* ************* ********** a.gormless txrate=14000000bps*95% linerate=15820000/1000 MTU=1500 
Dec 28 14:07:13 newclueless radius-acct: BBEU******** Start ********** ************* MRU=1500 linerate=13300000/1000


I can only bounce the router remotely, not the modem. Maybe that's why. I'm a little reluctant to hit the remote kill buttons on the A&A control page in case for some reason the line doesn't come back up again as I'm away until Sunday.

EDIT: On seeing your log files in the other post, I assume there's nothing to worry about. The only thing left on my to do list is make the iPhone PPTP VPN client connect over 3G, currently it only seems to work over wifi.
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Cheers,

Andy M