I Have a Wistera shrub and wish to move it do the roots go down very far

Impossible to answer without knowing how long the plant has been in its current spot - if its more than 3 years, it'll be next to impossible to get it out intact.

How quickly does it need to be moved ? and as Bamboo said if it over 3 years old it may not be possible.

It may also already be too late as it will be coming into growth soon ( if not already) , but it it is not an urgent move and the plant is still smallish dig around the circumference of the plant ( if it is not against a wall that is ) to sever any radial roots and give it a serious haircut .... maybe remove up to half of the branches to get it down to one leader stem ( I assume it is being grown as a climber not as a standard) about 2 foot in height or there abouts.

Every few days keep digging a trench around and a little bit under the plant until it is kind of sitting on a pillar of soil ( if you get my meaning), then once you have dug the hole where it is to go finish the job of removing it by digging under the plant and hoiking ( a technical term) it out.

If you remove lots of the foliage and keep it well watered in its new place then you have a better chance of it making it. It is developing flower buds maybe worth removing these to get its energies into making new roots and getting stronger.

Good luck.