Yup, the only thing you can ride with a car licence is a moped (under 50cc)
Once you have completed CBT you can ride up to 125 on L plates - if you like the look of the Tmax but are only taking CBT and not a test then the Tmax's little brother the Majesty 125 is a nice /useful bike and is capable of 70mph.
Don't forget you will have to re-take your CBT every two years if you don't complete a bike test.
hth