Privatisation of PSA Projects, due this month, faced new problems this week after a last-minute demand from the IPMS trade union to see confidential bid documents.The union wants to see the terms and conditions which each prospective purchaser will offer to PSA Projects staff who choose to transfer to their payroll.Ministers are examining five bids and are due to name the buyer at the end of September. All the bids are for the whole of PSA Projects, removing fears that the business would be split up.The IPMS wants consultation now on the terms in the bids because it fears it will not be able to improve these once the sale has taken place. Trade unions have little influence on behalf of professional staff in private sector consultants and contractors.Staff affected are those who choose to leave the civil service and join the purchaser's payroll. Other options are to work for the purchaser on secondment from the civil service, redeployment or redundancy.An IPMS spokesman said: 'We would be very reluctant to see staff given options without our having seen the terms and conditions.'Top environment department officials have so far insisted that the bid documents are confidential, but were said to be looking into the IPMS's demand.A DoE spokesman said: 'Ministers have been very careful to consult the trade unions and the staff at every step.'Meanwhile, environment minister John Redwood has confirmed that PSA Building Management - will be sold by the end of the year.BM's five regional businesses will be sold separately by trade sale rather than flotation.Bovis Construction has had a £3 million contract to lick the five into shape for the sale and is widely expected to buy the south-west region company.