TOMORROW AIB and other potential investors will be invited to present proposals to the Polish government on the future of Wielkopolski Bank Kredytowy. The Polish government is putting 20 per cent of the bank on the market. AIB already has a 16.3 per cent stake in WBK and an option to acquire a 24 per cent stake held by the European Bank for Reconstruction and Development. Markets sources have valued the Government stake at about £50 million.