This reminds me of Acorus, except that it's not showing the typical, fan shaped arrangement in the middle. I'm still looking, but so far I've come up blank - its unusual because its short and isn't flopping over, remaining quite upright.

I thought Japanese Rush which is an Acorus.

Thing is, Botanic, at this time of year, it tends to have a distinct hollow in the middle, with all the growth fanshaped around it, so I'm not really sure that its Acorus.

could it be a type of wheat grass?

It looks like an Acorus to me, too--probably A. gramineus 'Ogon'. Is it possible that the winter was mild enough to avoid the "hollow center" effect?

Thank you for all your comments. I looked up the photos of Acorus on GoY but they don't resemble my plant. it doesn't ever grow tall or have a fan shape to its growth, in fact it is always rather flat & just looks like an ordinary clump of grass except that it's golden( not variegated), with soft droopy habit. It does however often have a bare, hollow centre, tho' not at present, so perhaps Tugbret is right with his ID. I will make a note of this name & see if I can find a specimen to compare mine with. Thanks for trying for me. I'm quite pleased with it as it looks nice & bright in the winter.