....I’ve actually done it! Thanks again for giving me the idea, GrannyLaine.
By happy chance my leftover bit of material was just enough. Sorted out the inherited needles, too - have chucked some odd, bent or broken ones. Room for the set of crochet hooks, too, not that I’ve ever crocheted, but you never know. A lot better than the former jumble in a bag, anyway.
My knitting needles are in a drawer but my mum's and half my MiL's (SiL insisted we share them) are in an old music case, just jumbled together and I have to rummage when I want some. More often than not there are multiples of the same size but none of the size I want.
Sod’s Law, @Septimia - there so often isn’t the size you want. I recently had to buy some tiddly 2.25 mm. That was when John Lewis was (just) still open and I thought I might use up some of the stash by making ‘cakes’ (cupcakes and Swiss rolls!) for little Gdcs’ play shop.
(The ‘chocolate’ Swiss roll aroused a real yen for one, but so far I haven’t succumbed.). 😇