Raymond Duncan's article of July 28 quotes Brigadier Melville Jameson as saying that it was ''100% right'' to invite the People's Liberation Army (PLA) to the Edinburgh Military Tattoo. It seems this would add to cultural understanding and respect between the two nations.

Amnesty International has no problem with cultural engagement, but we do wonder why it is ''100% right'' that the PLA carry out this task. There is more than a little irony in the PLA being asked to represent China culturally, when a large part of their duties is the violent suppression of minority cultures within China. Culture is not really the PLA's thing. Massacres are more in their line. But there must be many musicians and dancers in China who have no connection with the PLA and its ever-lengthening record of human rights abuse.

When I met Brigadier Jameson in May to discuss the PLA invitation he told me that it had the very strong backing of the prime minister, the British ambassador to China and the Ministry of Defence. Impressive backers, to be sure. But does the prime minister normally get involved in approving the Tattoo's programme? Also, what are the cultural functions of the Ministry of Defence?

Whatever the reasons for the invitation being issued in the first place, we must ask if the high-level support it has attracted has anything to do with helping the UK position itself more favourably for future arms sales to China. After all, the long-standing (and very necessary) EU embargo on arms sales to China is under attack and who knows what business opportunities may shortly arise? Is that one of the reasons why it was ''100% right'' to invite the PLA?

Bernard O'Hear,

China co-ordinator, Amnesty International UK, 6 Castle Street, Edinburgh.