Possibly Incarvillea delavayi 'Snowtop'?

Hi, welcome to GoY, I agree with Landgirl, also known as the hardy Gloxinia but they're tap rooted perennials, not tubers, Derek.

Thank you all for helping my find the name of my plant you are a great help THANKS <p>

Sorry Derek I think you are wrong. Incarvillea have dahlia like tubers. Have a look at this link - http://www.gardenguides.com/video-61632-planting-incarvillea-bulbs.html

Hi Scotsgran, some people call them bulbs, some call them tubers, but the R H S call them tap roots, so you pay your money, and take your pick, I prefer to call them tap roots, Derek.

The RHS are the experts but Carrots have tap roots to my mind. How do the incarvillea expand underground as they spread. I'm not winding you up I just want to understand what is below the ground. You will realise I am just an amateur gardener who has not studied the subject at college.

Hi Scotsgran, this is going to be a short answer , but the long 1 would take too long, sorry.
Tap root, seed germination gives rise to the first root, known as a radical, the tap root forms from this, which then sends out lots of laterals called secondary roots, these send out more roots called tertiary roots, these branch out again, these are called rootlets, and have root hairs for absorption , the tap root grows deeper than the fibrous roots, and serves as a storage organ, it remains for the life of the plant.
There are 4 types of tap root.
{A} cone shaped.
{B} fusiform which is widest in the middle, with both ends tapered.
{C}napiform which is more or less spherical, widest at the top and small and very thin at the bottom.
{D} tuberous thick and fleshy and no definite shape, this is the form that Incarvillea belongs to.
Hope this has helped clear things up a little, Derek.

Thank you. Short but very illuminating. It certainly does make things clearer. I can't help always wanting to know more and it is good of you to help me out.

No problem Scotsgran, happy to help, Derek.

I'm obliged