In a lease extension matter it is believed that the landlord’s solicitors did not have authority from their client to sign the section 45 counter-notice under the Leasehold Reform, Housing and Urban Development Act 1993 which was served and therefore believed to be invalid. The landlord’s solicitors have confirmed that they were given such authority from the landlord to sign the counter-notice however they have refused to provide evidence of this upon request. Is there any way to compel the landlord’s solicitors to provide evidence of the authority?The landlord’s solicitors have confirmed that they were given such authority from the landlord to sign the counter-notice however they have refused to provide evidence of this upon request.Is there any way to compel the landlord's solicitors to provide evidence of the authority?Part II of the Leasehold Reform, Housing and Urban Development Act 1993 (LRHUDA 1993) allows a tenant to acquire a new lease of their flat by service of a notice under LRHUDA 1993, s 42. The landlord is permitted by LRHUDA 1993, s 45 to serve a counter-notice setting out whether the landlord accepts the right to acquire a new lease and if so which terms they dispute.By LRHUDA 1993, s 99(5), any notice given under LRHUDA 1993, ss 13 or 42 must be signed by each of the tenants or (as the case may be) by the tenant by whom it is given, and in any other case can be signed by or on behalf of each of the tenants. There is no corresponding requirement for a LRHUDA 1993, s 45 counter-notice to be signed, although they commonly are.Where a counter-notice is signed without authority by a solicitor on behalf of the client, it is possible that the counter-notice is invalid in the event that it was also sent without authority. In the event that the counter-notice is invalid, the court is obliged to grant a new lease on the terms set out in the LRHUDA 1993, s 42 notice. However, in this scenario although there is a belief that there was a lack of authority, there appears to be no evidence to support this contention, and a positive assertion that the solicitor did have such authority. In such circumstances it is likely to be virtually impossible for the tenant to demonstrate that this is not the case. In the face of a clear representation of authority by the solicitors, the tenant is not likely to be allowed to seek to go behind this. There is no mechanism to compel a solicitor to provide evidence of the scope of their instructions or authority to an opposing party. The solicitor has ostensible or apparent authority to sign a counter-notice, and here positively asserts actual authority.In those circumstances there is no way to compel the solicitor to disclose or provide evidence of their authority. If the matter proceeded to tribunal the contention could be made that the notice was invalid and questions could be asked in evidence as to whether the landlord gave such authority, but it is highly likely that such authority would be confirmed given the representations already made by the solicitor.For further reading, see Practice Note: Guide to lease extensions of flats under the Leasehold Reform, Housing and Urban Development Act 1993.