We had a conservatory built last year and now plan on installing 2 radiators. As the conservatory is off the living room can we run the 2 new rads in series with the living room one? i.e. Into the living room radiator through the TRV, out of this rad to the first then second radiator in the conservatory and then the return pipework connected to the original return in the living room. I realise using this method means I couldn't switch off individual radiators without it turning off the others in the circuit but am prepared to accept this. What type of valve/lockshield would be best suited for each radiator in this situation? Any help would be much appreciated.