I have just removed this from the Shifter user 1 module.I have not noticed a appreciable increase in traffic and more to the point I have been getting some slow load times for the site.
Now it maybe that the UkBanners code has nothing to do with this but my Shifter site has started Shifting again [...]

I have just signed up with UKBanners and enabled their code in the Shifter User 1 widget.You can see this as you browse through this site,its aptly named UKBanners.
UK Banners state the following

By including some HTML text in your web pages, you show banner advertising for other UK websites (like the one at the top of [...]