<https://www.aqua-heat.net/product-category/boilers/gas-boilers-hereford/>
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"Gas Boilers"
<https://www.aqua-heat.net/products/boilers/gas-boilers-hereford/worcester-gas-boilers/worcester-gas-flues-and-accessories/worcester-220mm-flue-extension-7716191133/>