Cannas and winter

I planted five Cannas in the spring and I understand they need to come out of the garden over winter. I did find an online video by Monty Don showing how to cut them down and place in pots to store for the winter.
My question is, should I do this now or wait a little longer? We had our first real hard frost last night so I'm thinking I need to do something soon.
Also when I remove them, will they be ok in the garage, as I don't have a greenhouse?
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I would do it now!
If the garage is frostfree they'll have to go in there if you don't have a greenhouse. They should be ok there. They won't need any attention until late spring.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I've left mine out in the garden this time. I've tidied the plants and put a heavy mulch on top of the plants. I'm hoping they will survive. Time will tell!!!