<Tr> <Td> 14 </Td> <Td> Roadford Lake </Td> <Td> South West Water </Td> <Td> Devon </Td> <Td> </Td> <Td> 36,910,000 </Td> <Td> 2,987,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Caban Coch </Td> <Td> Welsh Water </Td> <Td> Powys </Td> <Td> 1904 </Td> <Td> 35,531,000 </Td> <Td> 2,023,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Llyn Trawsfynydd </Td> <Td> Magnox Ltd </Td> <Td> Gwynedd </Td> <Td> 1928 </Td> <Td> 33,190,000 </Td> <Td> 4,800,000 </Td> <Td> </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Nant y Moch </Td> <Td> E. ON </Td> <Td> Ceredigion </Td> <Td> 1964 </Td> <Td> 32,564,000 </Td> <Td> 2,630,000 </Td> <Td> </Td> </Tr>

When was the last reservoir built in the uk