This is internal to the Home Office, and immigration officers are failing to act when people are detained for reasons which do not comply with the Home Office's own instructions Nor is there a time limit on detention. The Minister, Nicholas Baker, is still resisting giving detainees written reasons for their detention. It would be too expensive to translate these into the detainees' languages, he says. We support the recommendation that there should be better means of keeping detained asylum seekers informed about the progress of their cases, and that immigration officers who go to detention centres and prisons to conduct surgeries should be properly briefed on the cases they will have to deal with.But other important matters did not come within the NAO remit. Charter 87 for Refugees supports the recommendation that the Immigration Service should develop minimum standards for the care of asylum seekers who are held in detention.

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At Manchester Airport detainees may be held without charge or trial for up to five days in underground cells with no source of natural light Some other accommodation is also unsatisfactory.

From Mrs Antonia Hunt and Dr M. Louise Pirouet Sir: You reported (£22m in migrant fines uncollected, 22 February) on the National Audit Office's investigation entitled Entry into the United Kingdom. The NPT should be extended initially for a limited period and concrete steps put into place in order to achieve its aim - a nuclear weapon-free world.Yours faithfully,MARTIN JONESCND Vice-ChairLondon, N723 February. The non-proliferation regime is already under considerable strain (a situation exacerbated by the shortfall in funding for the International Atomic Energy Agency to carry out its safeguarding duties) and unless the nuclear states go into the NPT Conference in April with some very positive commitments it could start to unravel completely.Surely the time is ripe to start negotiations for a worldwide ban on nuclear weapons in order to remove this scourge from our planet forever. The NPT has two main purposes: to stop countries acquiring nuclear weapons and to get those who already have them to move to full nuclear disarmament. While it is true that the NPT has done a reasonable job in curtailing the spread of nuclear weapons to new countries, the fact remains that even after Start II there will be more nuclear weapons in existence than when the Treaty came into force in 1970. Far from disarming, the UK and French governments are introducing new nuclear systems (the UK's Trident programme represents a significant enhancement of its nuclear capability), and their policy statements make it clear that while they do not want others to acquire nuclear arms, neither do they want to give up the prestige and imaginary security conferred by their own.This state of affairs cannot go on. Sir: Your article ("Third World challenge to nuclear treaty", 20 February) and Gerald Clark's letter (23 February) about the nuclear Non-Proliferation Treaty both miss the point when they talk about non- nuclear states' demands for a limited, rather than indefinite extension of this important Treaty.

If the mountain is beyond your limitations on the day you choose to climb it, you shouldn't be seen dead there.The writer is the author of `Among Mountains', Mainstream Publishing, Edinburgh, £14.99.. He has learnt to run before he can walk - and may never learn to walk. I regret the pervasiveness of the Munro-bagging culture, and I hold it culpable.No one can look at the toll this and countless other winters have taken of men, women and children and deny that most of the deaths were avoidable, avoidable by following the only code of practice which works: self-regulation. It is no substitute for the apprenticeship and the joy of discovery. I regret the advent of that species of climbing school which can teach a 16-year-old to tackle what we used to call a "VS" grade in two weeks.