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Worse - if they are closed, and the boiler is on, you'd be circulating and heating water through a tiny loop.
That shouldn't be a big problem. You should always have one radiator without a TRV and the water in the short loop will rapidly reach the boiler set temp which will then switch off the burny bit.
jellybaby
You need to have the extension kit for the TRVs though - otherwise they won't call the boiler.
They'd just open & close the radiators, and only when the boiler is on (via another programmer I guess) would they heat up. Worse - if they are closed, and the boiler is on, you'd be circulating and heating water through a tiny loop.