In article , Steve
Harris writes
In article ,
(Alan Gould) wrote:

or you may not have given them
sufficient growing time.

Are they likely to mature further in the next couple of months. IE
improve in flavour even if they stay the same size?

That seems doubtful, but it may be worth giving them a try.
Bitterness in leeks could also be due to the plants being in an early
stage of bolting, or even soil composition.
--
Alan & Joan Gould - North Lincs.