A method of manufacturing a flow block for use as a T-Block, tree block, manifold block or valve block, the method comprising the steps of: machining a main bore (21) in a body; forming an opening (22) in the body in a side wall of the main bore; and inserting, into the opening, an insert (23) having a first bore intersecting with a second bore (25) and being in fluid communication with each other, such that the first bore is substantially aligned with the main bore in order to provide a fluid flow path between the main bore and the second bore. The method may be aimed at producing a tubing hanger with a nickel alloy, such as luconel, lining or clad.