I dont know for certain, but I should hope that 1.04T is g.inp compatible. The reason I say this is because TT supply the router as an ISP to their users, then it will have had to be tested through the BTlabs and one of the things they test is g.inp.
Depends how old 1.04T is, but the good thing is its a BCM chipset [dont know which model} so it will natively support PhyR, which should mean it will support g.inp