They might not be at exchange. Are you sure your solicitors have realised what you're doing? They could be mistaking your potatoshopped documents for a scanned wet signature.
Ok cool. You're presumably not at the relevant paperwork yet, could also depend on stuff like mortgage provider. E.g. Our mortgage offer has to be physically signed but you're probably not with Virgin Money.
They might not be at exchange. Are you sure your solicitors have realised what you're doing? They could be mistaking your potatoshopped documents for a scanned wet signature.