Can I move rhurbarb now.

[longwaytogo]

We've got a huge plot of rhubarb and we need to move it (now) as decking is going over it. If I move it will I kill it, or can I just dig it up and put it somewhere else and it will survive. Wish I wasn' such a useless gardener.

Think it will be okay to move now if its fairly died back ( mine has). If not, move anyway but just give it lots of water on a regular base.
If its fairy dormant ie: not doing much, this would be a good time to split into smaller pcs.
Just stick a spade through a natural splitting point and voila , you have 2 or more plants.

We haven't long bought the house and we inherited the rhubarb. We must have about 10 plants now, but it hasn't got very big, we have had rhubarb off it but not as much as I expected for the number of crowns we have. Maybe moving it would be good if we bought some fertiliser for the soil etc then maybe it would do better next year.

Sounds like the previous garden owners either recently bought the plants or divided them.
Good idea to incoperate fertilizer but make it a bulky one like well rotted manure - rhubarb love it.
Also they might need a rest. Just pick rhubarb from half the crowns next year then the other half the year after or [ick just a bit from each. That way the plants will get chance to build up.

please bear in mind you may not be able to post freely here in future

I think rhubarb is a fairly safe topic