Thank you for the advice Frankie.
I took a chance yesterday afternoon in soaking both gazania plants in water before repotting them.
The one that was wilting badly seemed to be a little perkier this morning with the flowers upright and in full bloom. However, after returning home this evening after a day out, the plant was wilting even more than yesterday with all the leaves and flower stems hanging over the rim of the pot. I am no gardener but even to my eyes it looks in bad shape. It's a pity because the flowers are very vibrant and stunning. The other plant seems to have settled into its new pot quiet nicely.
I bought the two plants from the garden centre next to Longos at a price of 1.50 euro each
Richard