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http://www.planningportal.gov.uk/permission/responsibilities/buildingregulations/failure
"First, if a person carrying out building work contravenes the Building Regulations, the local authority may prosecute them in the Magistrates' Court where an unlimited fine may be imposed (sections 35 and 35A of the Building Act 1984). Prosecution is possible up to two years after the completion of the offending work. This action will usually be taken against the person carrying out the work (builder, installer or main contractor)."
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Will check with a couple of architects (a friend and the one that did the drawings for the planning permission) and see what they think. Thanks for your help @Sumo!
what if we get a negative result, I pretty much doubt that ground floor is safety glass as they even forgot to get the bathroom windows frosted and ended up putting a fricking sticker, pretty poor job overall...