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self building house, builders laying first trench blocks onto foundations of new build home Stock Photo - Alamy
S B Building supplies ltd - Large stock of thermalite blocks Trench and standard available and ready to deliver. Trench £3.50 plus vat Standard £1.20 plus vat | Facebook
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Forterra Thermalite Aircrete Tongue and Groove Trench Block,Forterra Thermalite Aircrete Tongue and Groove Trench Block | Turnbull
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