I have now had this problem fixed by my "local" Skoda dealer. It was described as a faulty gear selector lever and the part was provided free of charge but I had to pay 3/4 of the labour charge coming to a total of £148.50. Skoda paid for the remaining 1/4 and might have paid more but apparently they took "brand loyalty" into account and this was the first time that I had put my car in a Skoda garage since new nearly 5 years ago. However, it took 4 trips to sort this out. One to identify the problem, the second to fit the replacement part that was then found to be defective, the third to fit the 2nd replacement part and the fourth to remedy the problem with the 2nd part. Rather frustrating but at least it is working for the moment. My car was 20 months outside warranty but this was recognised as a common fault, hence the generosity of Skoda!!! Thanks for all comments.