I'm unsure if you'll see this reply with the topic being quite old, but I found out today (via a Youtube ad, no less - well targeted, sort of!) that Nixon Williams now have an online portal, called Vantage: http://www.nixonwilliams.com/vantage - judging via the Wayback Machine, it has only been around since February this year.

If you speak to your account controller, they'll be able to set you up a dummy account to see if you like it - my understanding is that this would replace the monthly submissions of expenses and invoices, and give you a better real time view of your profit/loss, but you should still get the same level of service and attention paid to your account and it costs no extra. I'm still waiting for confirmation of all that (my worry being that I could make a mistake and it wouldn't get spotted, whereas it would with a monthly submission to a human) and for my account to be set up, so I can't comment any more on it, but it's definitely worth a look!