i have jst purchased 11 packs of ashbourne riven patio packs for my bk garden in cotts buff colour.my garden is all levelled with stone and has eco drains fitted .the problem is no one want to lay them apparently there a nightmare to lay ,1 builder says they need full bed morter whilst the other says different ??? please can anyone shed any infomation about these slabs or even on what they should be laid on thankyou !