In an earlier contribution to this discussion,
Peter Taylor wrote:

Jon, the drain collar was originally intended for an S trap pan
complying with the old BS, with a separate cistern and a flush pipe.
Might even have been with a high level cistern. Replacement with a
close coupled suite is problematic, as you've found. You can still
get S trap pans (Twyford Classic for instance). It would save you
needing to cut off the collar.

Peter

Except that it's in the wrong place (too far from the wall) for a
close-coupled pan - and the OP specifically wants close-coupled.
--
Cheers,
Set Square
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