Erhhhh - probably not. DVB-T2 is a transmission standard and your TV probably never had an HD "tuner" as such and would need a set top box to receive terrestrial HD broadcasts anyway. Your TV will still be able to display an HD picture from a DVB-T2 broadcast, so long as you have a "set top" box that supports it.
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@Red Bren
Erhhhh - probably not. DVB-T2 is a transmission standard and your TV probably never had an HD "tuner" as such and would need a set top box to receive terrestrial HD broadcasts anyway. Your TV will still be able to display an HD picture from a DVB-T2 broadcast, so long as you have a "set top" box that supports it.