Hello there,
Unfortunately from what you are describing this could be quite a complicated network configuration, especially if you have a routed IP space from virgin in your network. Usually three routers won't work together purely by cabling if you want to have a contiguous network space, as they would have different gateways and outgoing IP addresses and all other manner of complication.
Whether this can be sorted out via a phone call is up for question; I personally wouldn't consider this anything short of a site visit to do the proper investigation to ensure that I understood all the physical and network restrictions on top of the actual requirements you have.
The fee given would be for a days site visit to work with you to understand and implement what you have and require.
Good luck.
/R.