How are you guys covered for broadband at the moment? Is there a chance the uptake will be quite high?
VM will install the bare minimum of capacity and may be somewhat tardy about upgrading it, even though it'll be relatively easy to do so.
Ports cost money. Once the network is in the ground and live it moves to operational expenditure, and that particular purse string is tighter than a camel's sphincter in a sandstorm.
Incidentally do not order the Business 'Voom' service with a static IP address. VM cannot support this properly, know they cannot support it properly, but sell it anyway.