Labelling children with educational needs is far easier than living down the label. Having lived through the difficulties of a child with learning problems I sympathise with parents wanting to find a reason But that doesn't treat the symptoms. A resolution for Salisbury, as elsewhere, would be action for fewer vehicles on all roads. Rosalind Chaloner is right to say that this is a national problem requiring a proactive transport policy, rather than a local one as implied by the recent transport Green Paper. Integration is a very different process which usually involves a change in state. The inadequacy of this approach is being demonstrated at the Heathrow Terminal 5 inquiry. The Department of Transport ties itself in knots endeavouring to balance incomparables, even though UK sustainable development legislation requires these opposing aspects to be "integrated" and "reconciled" rather than weighed or balanced.

Please, please, Mr Birt, realise what a lifeline the BBC and World Service are for people who, for one reason or another, are isolated from the larger cultural world, which, to its credit, the BBC brings us daily. And, finally, where there is a will there is a way.Sara RogersLondon SW5. In supporting the Salisbury bypass your correspondent makes the popular mistake of trying to balance economic benefits against environmental benefits (Letters, 21 July). In 1990 I returned to the US supposedly for good, but could find no comparable radio to enrich my working hours. I moved back to Britain partly, as I am not ashamed to admit, due to the superior quality of the UK media.

As a teenager and young woman in the 1960s, I dropped out of higher education and succumbed to the allure of sex 'n' drugs 'n' rock 'n' roll But my aspirations were for more. As I came from a non-intellectual background, I saw no role models or prototypes for a larger cultural life in my immediate environment and certainly not from the US media. In 1975 I moved to Britain and can honestly say that after 21 years of reading the broadsheets and watching and listening to the BBC I am better informed and better educated than many of my university-educated contemporaries in the US.I never listened to the World Service in America but Radios 3 and 4 have been my lifeline here in an isolating and not very stimulating job. Thank You to my compatriot Michael Goldfarb for saying what I, too, would like to say to John Birt and his bean-counting minions at the BBC ("Bush House belongs to the world", 21 July) I am a New Yorker of lower-middle-class origins. The chief problem with the electoral registration system is that it is predicated on outdated social patterns. A voter registers where they live in October and keeps their vote at that place for up to 16 months. But increasinglypeople move around for economic and social reasons. The solution is relatively simple and cheap - the introduction of a rolling register so that, with suitable safeguards against fiddling, citizens vote where they live, when they live there.

But the Home Office refuses to accept the argument, on spurious cost grounds, but probably because they calculate that the Conservative Party benefits from high levels of electoral exclusion.Harry Barnes MPHouse of CommonsLondon SW1. This has been described as "broadly correct" by the director of statistics at the former Office of Population Censuses and Surveys. However, massive under-registration - which compromises democracy, damages census surveys, distorts opinion polls and central government grants to councils - cannot be blamed exclusively on the poll tax. Other reasons include increasing political alienation and rootlessness. My own estimates are that between 3 and 4 million people are disenfranchised. Until its imposition, electoral registration levels were generally high When it became law they dipped dramatically.