John Rumm wrote:

Andy Burns wrote:

It says "engineered" which could mean the insides aren't what you'd
expect ...

That usually means MDF core with real wood overcoat...
Hence you *might* expose the MDF at the sides when cutting it.

The last door I bought from B&Q was manufactured by Jeld-Wen, it arrived
with instructions saying how may mm could be cut from top, bottom and sides.