Unknown Flower

Hi, wondering if anyone could tell me the name of a small flowering plant I was given last year, it has bloomed already about a month to 6 weeks ago but there are new flower stems ready to open again soon.

It very similar looking to a Gladioli in both its leaves and flowers (small red flowers), but it is much smaller (maybe 1ft to 1ft 6in) and grows in a clump, it is also winter hardy having grown in my Mother's garden for years now. Thanks