The suggestion that the Oasis gigs will “inject £940 million into the UK economy” (Will it be rowdier than the rugby? Cardiff gears up for Oasis reunion opening night , 3 July) is the type of thing said about any big events, but I suspect that there is no injection, as it’s not “new” money being created: people chose to spend their pre-existing cash on one thing instead of something else. Certainly as a Cardiff resident I won’t feel any financial benefit from the Oasis gig.David RennieCardiff • It has been alleged that Palestine Action caused £7m of damage to two Voyager planes at RAF Brize Norton. I would like to recommend my new business to the RAF – I would clean their planes of red paint for the bargain price of £5m, thus saving the government £2m. A bargain. Where can I apply?Richard FieldingAbthorpe, Northamptonshire • When my son, at 36, said he was about to learn the bagpipes (Letters, 3 July), he was unamused when I asked: “How will you know when you’ve done so?”Roy ArnoldTenterden, Kent • What’s the difference between an onion and a set of bagpipes? Nobody cries when you chop up a set of bagpipes.David JohnsonDumfries • In defence of the bagpipes: go and listen to the mass bagpipes at the competitions held in southern Brittany each summer. Wonderful!Julia JonesHolmfirth, West Yorkshire • Have an opinion on anything you’ve read in the Guardian today? Please email us your letter and it will be considered for publication in our letters section.