It would probably cost very much considering that TVR produce
cars in limited batch quantites and the fact that they are not
officially homologated for use on Singapore streets. You would need
to get the car, whether is the 300C or the new Sagaris, tested for
emissions (or provide tested figures compatible with Singapore
requirements), sound regulation, and a safety/ engine
inspection.
I do know, however, that there is one Cerebera in Singapore. If im
not wrong TVR produced (or still produces?) some of their models in
Malaysia and thus it would not be as difficult to bring this
example into Singapore (although it still would be far from
cheap!).