Worms

Can't quite envision what you mean - is your patch on top of hard standing or surrounded by it?
Have you got a compost heap - if I remember correctly some people get worms for 'wormeries' from angling shops...

Pip pip,
Balders

No I don't think they will die but will not be active if the weather is cold.

Make a compost bin put manure and any rotting veg and they will come on their own no need to buy them really.

My worms love the sediment from primary fermentation of wine they go mad for it 

My worms love the sediment from primary fermentation of wine they go mad for it 

I have this picture in my head now of worms partying wildly on wine sediment     

its a built box out of pallets ontop of hard standing, and yeh is it worth buying worms from a wormeries, or will they die during the winter with the frost and cold weather,

If the weather gets really cold, worms migrate right into the centre of a compost bin, so I think they will do the same in a large raised bed.  If you mulched at least part of the bed, that would help keep the worst of the frost out as well 

Worms find their way across concrete and into pots. If your hard standing is packed rubble rather than concrete the worms will soon be there once they smell the ooze from the bottom of the heap.

Find someone digging out or turning their compost heap and beg a bucket of worm laden compost to seed your heap.

My thoughts on worms -

The type of worms raised for composting are of the 'Epigeic' type (although some articles put them into a special group all by themselves and call them compost earthworms) - anyway they appear to live and feed in the surface litter and do not have permanent burrows, they also are killed by hard frosts. Consequently there really is no point in putting them anywhere apart from a compost bin unless you are applying surface mulches to your plot.

Conceivably if you put loads down with plenty of worm casts the cocoons will stay dormant until you put some organic matter on top in the spring, they'll then hatch/do their thing/die and leave more cocoons until a cow comes along an puts a pat over the top of them. I'd have thought that this is the wrong time of year to do that as they're not going to do very much if you spread them in a thin layer as soon as the first frosts come along.

In anycase, I certainly wouldn't be buying them. As others have said - get the conditions right and they'll turn up for free soon enough.

What you really want I think are common earth worms that make burrows and can get into the centre of the raised bed where it will be warmer if you get hard frosts. Go out when it's raining at night to any lawned area. Take a torch and a container with you. When you spot a worm, get hold of it firmly but don't pull or you'll snap it and it will die. Just keep hold of ot and it will eventually grow tired and release it's grip.

Couple of tips...walk very quietly and grab the little critter as soon as you spot it! They are light and vibration sensitive.

I'm a keen angler and I've done this lots of times...you should be able to collect 40-50 of the blighters in no time at all.