Also, is the building your dad's or something? If so, you're lucky to have your own facility. It will remove a ton of the BS that you may have to deal with regarding large corporate colos (scheduling power installs, arguing over cab to cab crossconnect rates, etc).
I foresee a couple of issues with your plan;
- you will always be tied to virginmedia or whomever for IP transport (when you want to mix in other IP transit providers). Transporting SUCKS because it really adds to your costs, vs being in a well connected DC.
- No generator or UPS backup it seems
Dont fret, focus on selling based on CUSTOMER SERVICE, grow your business, and then upgrade the infra as cash flow allows. I agree with those above that your "core" sucks, but you should see if you can get any customers first. I would focus on small biz/webdesign type customers, or hosted email, etc, the low bandwidth type of clients, or local clients that you can sell to based on a handshake and a smile.
Good luck