At nearly 75, I have to sit on the front seat at the top of the bus like Justin Myers ( 49 ways to have fun right now!, 4 May ). I have been known to let one bus go and wait for the next one if there are people in my seat. If it ever gets to the point where my legs won’t get me up there, I shall know that my time has come. Liz Fairhurst Banstead, Surrey Sara Hudston’s country diary ( 6 May ) chimes exactly with the sightings on our weekly butterfly count for Yorkshire Wildlife, similarly on a dismantled railway siding, here in North Yorkshire. The holly blues are particularly numerous this year, but we have yet to see an adder. We have, however, had a huge Morel toadstool, which can occur where there are heavy metal deposits. Gill Mawby York Re cutting speed limits ( Report, 7 May ), back in 1977 Jimmy Carter reduced speeds to 55mph due to oil shortages. We were travelling for three months around the US on Greyhound buses and, I think, saw much more of the country because of the slower pace.…