CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement No. 333-293254 on Form S-6 of our report dated April 30, 2026, relating to the financial statement of FT 12851, comprising Vest Large Cap Deep Buffered 30 Portfolio, Series 55, one of the series constituting the FT Series, appearing in the Prospectus, which is a part of such Registration Statement, and to the reference to us under the heading "Experts" in such Prospectus.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois

April 30, 2026