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PPS re: photos, should have added - in a day or so. Havent taken any yet. But going back to the pressure issue. Am I right to wory about the increased pressure of a combi boiler in combination with rads and pipes that were made for 1974-vintage gravity-fed system?

WARNING - Long!! Hi, 1st time poster here. This concerns my Dad's boiler/heating system - house was built 1974, 4-bed detached. He has a conventional GRAVITY-FED system: - tank in loft - cylinder + immersion heater in airing cupboard (upstairs) - boiler is in the kitchen, a...