Did you test the washers before the car went to be tested? ... if they worked I'd guess its a blocked pipe/jet or a failed fuse ... not sure which one ... there should be a list in the owners handbook or printed on the underside of the fuse cover.
Thanks Truckbusuk. Ive only had the car a month, but it looks (after checking) that the problem is in the fuse box. The fuse is a very bad fit (it is a Renault part) and it doesnt seem to be connecting, incidentally the fuse box is the one beside the glove box, and without long nose pliers its impossible to get out, the plastic fitting supplied cant do the job. Anyway thanbks for your prompt help