3. In the case of Potts (or Riddell) v. Reid (1943) AC 1 Lord Thankerton said: "The respondent, however, maintained that the statutory provisions which afford grounds on which he would be held not to have committed an offence or not to be liable to conviction of an offence equally provided grounds which would be a good defence to the present civil action. In this matter, the relevant statute is the Factories Act, 1937, and the relevant sections are ss. 130, 136 and 137, which are in Pt XII of the Act relating to 'Offences, Penalties and Legal Proceedings', as modified for Scotland by s. 156. In my opinion, these sections, which solely relate to criminal prosecutions and contain no reference to civil liability, do not affect the existence of a contravention of the Act or regulations or the law applied in M'Mullan's Case (4). In my opinion, it would need some provision in the Act as to civil liability to relieve the employer of his absolute obligation towards the workman. Such a provision is to be found in s. 102, sub-s. (8), of the Coal Mines Act, 1911, and reference may be made to Coltness Iron Co. Ltd. v. Sharp (1938) AC 90 . There is no such provision in the Factories Act, 1937" (1943) AC, at p 11 . (Sections 130, 136 and 137 of the Factories Act are in Halsbury's Statutes, 2nd ed., vol. 9, pp. 1104, 1107. Section 102, sub-s. (8), of the Coal Mines Act, 1911, is replaced by s. 157 of the Mines and Quarries Act, 1954: - see Halsbury's Statutes, 2nd ed., vol. 34, p. 627.) M'Mullan's Case to which Lord Thankerton refers is Lochgelly Iron and Coal Co. Ltd. v. M'Mullan [1933] UKHL 4; (1934) AC 1, at p 13 . He referred to this case at p. 11 of the report of Potts (or Riddell) v. Reid (1943) AC 1 . Lord Wright observed: "The point has not arisen precisely for decision, but I should be disposed to think that prima facie qualifying words in the statute (the Factories Act, 1937) which are directed to affording a defence against criminal responsibility do not affect civil liability to answer for damages caused by a breach of the duty to the workman" (1943) AC, at p 25 . Lord Porter said: "I assume however without deciding that the respondent in the present case (Potts (or Riddell) v. Reid) has established the necessary facts to show that he was not guilty of an offence. Does this assumption provide him with a defence against civil liability?" (1943) AC, at p 30 . Lord Porter referred to the decision of Fletcher Moulton L.J. in David v. Britannic Merthyr Coal Co. (3) and to the decision of Lord Atkinson in Watkins v. Naval Colliery Co. (1897) Ltd (1912) AC 693 . This decision is expressed as follows: "Nothing can, I think, be plainer than that" (s.50) "is a matter of defence to the criminal liability, the burden of proving which rests upon the owner, agent or manager, as the case may be, who desires to exculpate himself. And if it be a defence against criminal responsibility it is clearly, I think, a matter of defence against civil responsibility also." Lord Wright (1943) AC, at p 24 suggests that Lord Atkinson arrived at his decision "on the particular words of the statute". Lord Porter continuing his reasons for judgment in Potts (or Riddell) v. Reid (1943) AC 1 said: "Which principle, then, is to be applied in the present case: the view of Fletcher Moulton L.J. in David v. Britannic Merthyr Coal Co. (1909) 2 KB 146 , criticized though it may have been by members of your Lordships' House, or that contained in the words of Lord Atkinson in reference to the breach of a regulation not absolute in its terms: Watkins v. Naval Colliery Co. (1897) Ltd (1912) AC 693, at p 705 ? My Lords, in my view, the former ought to prevail. Criminal and civil liability are two separate things. A higher degree of negligence has always been demanded in order to establish a criminal offence than is sufficient to create civil liability. An obvious illustration is the difference between the degree of negligence in accident cases required to prove the crime of manslaughter and that sufficient to create civil liability. The legislature might well be unwilling to convict an owner who failed to carry out an absolute statutory duty of a crime with which he was not himself directly concerned, but still be ready to leave the civil liability untouched" (1943) AC, at p 31 . In Harrison v. National Coal Board (1951) AC 639 Lord Porter made these observations: "In my opinion the decision of your Lordships' House in Riddell v. Reid (1943) AC 1 , is not in any way inconsistent with this view. That decision turned upon the terms of s. 137, sub-s. (1), of the Factories Act, 1937, under which there could be no question but that a personal duty was placed upon the owner. The Building Regulations, 1926, the construction of which was in question, in terms imposed such an obligation. They are introduced by the words 'It shall be the duty of every contractor and employer of workmen to observe such of the requirements in Pt I of these regulations as affect any workman engaged by him', and Pt I is headed 'Duties of Employers'. Plainly therefore they cast upon employers themselves the burden of fulfilling them. The only matter in dispute was whether he was excused under the terms of s. 137, sub-s.(1), of the Act. That section, however, imposed no obligation. It was aimed not at lessening the duties of the owner but at excusing him from certain sanctions if he failed to carry them out: admittedly it freed him from any criminal offence in certain events and the only dispute was whether it also excused him from liability to pay damages in a civil action. It was held that it did not" (1951) AC, at p 657 . (at p403)