This was discussed elsewhere on the forum some time ago, but here goes.
The blazon (to use the correct term!) used by King Edward's Witley, referred to by Katherine, is CORRECT and that currently used by C.H. (i.e, identical to K.E.W.) is INCORRECT. The problem lies with the rose.
The correct description for C.H. is that the rose should be argent (i.e., silver, but usually shown as white) with gold seeds and green barbs.Further, the flower should be a "rose of the field" rather than a "Tudor rose" - but I hasten to add that I do not understand quite what that entails.
For afficionadoes, the correct description, as supplied to me by Somerset Herald, is: "Argent a Cross Gules in the first quarter a Sword erect of the last on a Chief Azure a Rose of the Field barbed and seeded proper between two Fleur-de-Lis Or " (College of Arms Grants 117.80).
In other words, the main Cross and the sword are red. The bar across the top is blue, with two gold-coloured Fleur-de-Lis flanking a SILVER/WHITE rose.
C.H. always used to show this correctly - see, for example, the badge on the drum at the head of this page - but it got changed to gold about 15-20 years ago, probably as a result of some innocent misunderstanding by someone who did not realise the significance.
I have pointed this out several times to C.H. whose reply is that it will be changed to the correct rose 'in due course' - which hasn't arrived yet!
David
PS. Before his father corrects me, I should point out that this was originally brought to light by Lieutenant Jonathan Eastburn, Old Blue, the youngest commanding officer in the Royal Navy today and who has many, much more important things to worry about!