Thanks MattUK, I was convinced there was more too this than just keyword backlinks. There are lots of places to get a username or an icon which link to your website on PR7+ sites and I will get some of these and see how it goes.
Exactly! Funnily enough that's as close to a 'natural' link profile as you get. With my link building I try to make it as diverse as possible, including factors like anchor text, deep linking, sources of links, and types of link. It's not really difficult to see from Googles point of view that they'll be looking for patterns, so any kind of uniformity in link profile is going to be spotted pretty quickly.