You could always use a multi-signature form!
FOR DESIGN I/We being the person(s) responsible for the design of the electrical installation (as indicated by my/our signatures below), particulars of which are described above, having exercised reasonable skill and care when carrying out the design hereby CERTIFY that the design work for which I/we have been responsible is to the best of my/our knowledge and belief in accordance with BS 7671:2008, amended to ............. (date) except for the departures, if any, detailed as follows: Details of departures from BS 7671 (Regulations 120.3 and 133.5): Details of permitted exceptions (Regulation 411.3.3). Where applicable, a suitable risk assessment(s) must be attached to this Certificate. Risk assessment attached The extent of liability of the signatory or signatories is limited to the work described above as the subject of this Certificate. For the DESIGN of the installation: **(Where there is mutual responsibility for the design) Signature: ................................. Date: ............... Name (IN BLOCK LETTERS): ................................................ Designer No 1 Signature: ................................. Date: ............... Name (IN BLOCK LETTERS): ................................................
Designer No 2** FOR CONSTRUCTION I being the person responsible for the construction of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the construction hereby CERTIFY that the construction work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671:2008, amended to .............(date) except for the departures, if any, detailed as follows: Details of departures from BS 7671 (Regulations 120.3 and 133.5):
The extent of liability of the signatory is limited to the work described above as the subject of this Certificate. For CONSTRUCTION of the installation: Signature: ................................. Date: ............... Name (IN BLOCK LETTERS): ................................................ Constructor FOR INSPECTION & TESTING I being the person responsible for the inspection & testing of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the inspection & testing hereby CERTIFY that the work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671:2008, amended to .............(date) except for the departures, if any, detailed as follows: Details of departures from BS 7671 (Regulations 120.3 and 133.5): The extent of liability of the signatory is limited to the work described above as the subject of this Certificate. For INSPECTION AND TESTING of the installation: Signature: ................................. Date: ............... Name (IN BLOCK LETTERS): ................................................ Inspector