Hi was wondering if you could answer the following question with regards to radiator replacement. I am replacing 3 of my radiators which currently use 10mm piping connecting to either ends of the radiator. I wish to replace the pipes with 15mm Chrome-plated pipe, just below the floor with compression converter fittings, will this cause any issues with regards to a drop in pressure in the system and its functionality? The current system is gravity fed from a tank in my loft. I'm assume this should be ok as it is only a 20-30cm section I'm replacing for Aesthetics sake. Your advice would be greatly received. Cheers Dave. 
