Looking back at this now I have included a quick diagram of how things kind of look currently. As stated we currently have a layer 2 core switch with a flat network. The plan is to get a new layer 3 core switch and implement a couple of vlans. So if I swap out our current core switch for a layer 3 and setup the vlan interfaces on this so I can do the routing between vlans within our internal network. And then on our core switch set the default gateway to the current default gateway issued by the BGFL, obviously I cannot touch any of the settings on anything above our core switch so this is where I am getting abit lost with ensuring the different vlans can route out to the internet. (I'm presuming this will be fine because I am going to subnet within our given 10. range).
Any help would be appreciated.
Thanks