Can anyone advise if rhubarb can be grown in pots of compost
I believe it can - in a really big pot because it will become a hefty plant. I'd use a soil-based compost and add some manure if you can (you can buy rotted farmyard manure from garden centres).
COGIE rhubarb will grow in pots of compost but require a lot of care an watering.
These three were too small to sow out last winter and were kept in pots to go out this winter. Don't know if it would be practical to keep them longterm in pots. But if you have no space then have a go.
I would say that you would need a pot much bigger than the one on the right above for the long term, just to give you an idea
I agree with Fleurisa the pots above are too small for a harvestable crop. A tub big enough to hold a borrowfull of farm yard manure would be needed me thinks.