works under this Part of this Schedule exceeding that which would have been involved if the  apparatus placed had been of the existing type, capacity or dimensions, or at the existing depth, as  the case may be, the amount which apart from this sub-paragraph would be payable to SGN by  virtue of sub-paragraph (1) will be reduced by the amount of that excess save where it is not  possible or appropriate in the circumstances (including due to statutory or regulatory changes) to  obtain the existing type of apparatus at the same capacity and dimensions or place at the existing  depth in which case full costs will be borne by the undertaker.  (4) For the purposes of sub-paragraph (3)—  114. —(1) Subject to sub-paragraphs (2) and (3), if by reason or in consequence of the  construction of any such works authorised by this Part of this Schedule (including without  limitation relocation, diversion, decommissioning, construction and maintenance of apparatus or  alternative apparatus) or in consequence of the construction, use, maintenance or failure of any of  the authorised works by or on behalf of the undertaker or in consequence of any act or default of  the undertaker (or any person employed or authorised by him) in the course of carrying out such  works, including without limitation works carried out by the undertaker under this Part of this  Schedule or any subsidence resulting from any of these works, any damage is caused to any  apparatus or alternative apparatus (other than apparatus the repair of which is not reasonably  necessary in view of its intended removal for the purposes of the authorised works) or property of  SGN, or there is any interruption in any service provided, or in the supply of any goods, by SGN,  or SGN becomes liable to pay any amount to any third party, the undertaker must—  (2) The fact that any act or thing may have been done by SGN on behalf of the undertaker or in  accordance with a plan approved by SGN or in accordance with any requirement of SGN or under  its supervision including under any watching brief will not (unless sub-paragraph (3) applies)  excuse the undertaker from liability under the provisions of this sub-paragraph (1) unless SGN  fails to carry out and execute the works properly with due care and attention and in a skilful and  workman like manner or in a manner that does not accord with the approved plan or as otherwise  agreed between the undertaker and SGN.  (3) Nothing in sub-paragraph (1) imposes any liability on the undertaker in respect of—  (4) SGN must give the undertaker reasonable notice of any such third party claim or demand  and no settlement or compromise must, unless payment is required in connection with a statutory  113 (a) any damage or interruption to the extent that it is attributable to the neglect or default of  SGN, its officers, servants, contractors or agents; and  (b) any authorised works and/or any other works authorised by this Part of this Schedule  carried out by SGN as an assignee, transferee or lessee of the undertaker with the benefit  of the Order pursuant to section 156 (benefit of order granting development consent) of  the Planning Act 2008 or article 9 (consent to transfer benefit of order) subject to the  proviso that once such works become apparatus (“new apparatus”), any authorised works  yet to be executed and not falling within this sub-section 3(b) will be subject to the full  terms of this Part of this Schedule including this paragraph 114.  (a) bear and pay on demand the cost reasonably incurred by SGN in making good such  damage or restoring the supply; and  (b) indemnify SGN for any other expenses, loss, demands, proceedings, damages, claims,  penalty or costs incurred by or recovered from SGN, by reason or in consequence of any  such damage or interruption or SGN becoming liable to any third party as aforesaid other  than arising from any default of SGN.  (a) an extension of apparatus to a length greater than the length of existing apparatus is not to  be treated as a placing of apparatus of greater dimensions than those of the existing  apparatus; and  (b) where the provision of a joint in a pipe or cable is agreed, or is determined to be  necessary, the consequential provision of a jointing chamber or of a manhole must be  treated as if it also had been agreed or had been so determined.  Indemnity 