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thanks both for the comments. First freeze happened with old poor lagging so had relagged with new after fixing leak. Lagging is obviously recommended but many forget it only delays the feeze if the fluid inside the pipe is not being replenished as a result of flow. If the fluid is static...

we have dual small storage tanks in the attic connected together with 22mm pipe. One feeds the low pressure cold and hot water. Question is that both tanks have a supply and ballcock taken from the common 15mm rising main. Because the ballcock valve in each tank operates slightly differently...