If you have a V7 web hosting plan, you can now order bolt-ons. A bolt-on is a way for you to quickly add more disk space, bandwidth, email addresses, addon domains, parked domains, and shell access to any account without upgrading to a different hosting plan.
Bolt-ons are billed from £1+VAT per month increments (except for shell access, which you can activate for free).
If you have a V7 hosting plan, you can order bolt-ons via your client area. When you login to your client area, you’ll see a link to ‘Add or Remove bolt-ons’ when you visit ‘My Hosting’ -> ‘View Details’.
I've been using evohosting for a long time. Whenever I've had any problems, usually through my own messing around (losing files, etc.) the evohosting team have been there to sort them out, quickly, patiently, and got me back up and running. I'd never dream of using anyone else.