These can be difficult to find in nice condition. I never have as much of this issue as I would like in stock. Ensure that the set is correctly identified and has not been confused with the earlier 1926/7 and London Pictorial definitives. Make sure when purchasing a 2d blue and violet that you have the correct stamp. It is much misidentified. Lovers of shades will find plenty to collect on the 4d and 2s6d values. The 6d with watermark upright can be a tricky stamp.