I haven't found the 1850 cost, but the Marriage and Registration Act 1856 Section X: states:
Form of Licence for Marriage. The Form of a Licence for Marriage so to be granted as aforesaid to any Party or Parties, by the Superintendent Registrar of any District as aforesaid, shall be in the Form or to the Effect of the Licence set forth in Schedule (C.) to this Act annexed; and for every such Licence the Superintendent Registrar granting the same shall be entitled to have and receive of the Party requiring the same the Sum of One Pound Ten Shillings, over and above the Amount paid for the Stamps necessary on granting such Licence.
Section XXIV gives the cost of searching and providing a copy of a certificate:
The Registrar General, on Payment to him of the several Fees herein-after mentioned, shall allow Searches to be made in the Returns so made to him as aforesaid, and shall give to any Person demanding the same a certified Copy thereof or Extract therefrom with respect to any Place of Meeting for Religious Worship contained therein; and every such certified Copy or Extract shall be sealed or stamped with the Seal of the General Register Office, and when so sealed or stamped as aforesaid, if tendered in Evidence upon any Trial or other judicial Proceeding in any Civil or Criminal Court, shall be received as Evidence of the Place of Meeting therein mentioned or described having been at the Time in that Behalf therein stated duly certified and registered or recorded as by Law required, without any further or other Proof of the same ; and the Registrar General shall be entitled to demand and receive for every Search in the said Returns extending over a Period of not more than Ten Years the Sum of One Shilling, and for every additional Period of Ten Years the Sum of Sixpence, and the further Sum of Two Shillings and Sixpence for every single certified Copy or Extract.
Hope this helps
Philip