I did briefly look into this, but the Business plan's really really are aimed at businesses.....
ie. gaming is always 2Mbit, and Youtube is throttled to 2Mbit 7pm - 10pm.
Use the Plusnet user group comparison tool to see for yourself: http://usergroup.plus.net/prodcomp1.php
I'm not saying a proper FTTC/P plan for business won't address this to an extent, but using the current one could leave you with slower than expected speeds.