@the_r_sole just to clarify for others who may be following. I'm assuming your referring to a PCC (Professional consultants certificate) which is advocated by the CML (Council of mortgage lenders).   They may on the face of it seem better, and simpler. However I am yet to find out the cost difference between a SW (which seems very expensive! - £3400 for me) and a PCC, where it would seem the architect provides this and does inspection, signs it off and then really you just need to add