Thanks for the thoughts above. Have decided on that basis to avoid polarised, and Oakley Black Iridium lenses.
Are these Randolphs available in the UK, as I have never heard of them before?
Unfortunately my Oakleys are a discontinued model, and cannot be repaired, so (having sent them back twice before) I get a 50% off deal to replace them, or get the broken pair returned. On that basis it might be wise to get the sports pair from Oakley, getting a separate aviation pair.