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With the advent of chiral perturbation theory (I PT), the low-energy effective field theory of QCD, accurate calculations have become possible for hadronic reactions. The extension of the approach to pion production in nucleon-nucleon collisions r equires new high precision experimental information in the near-threshold region. Of especial interest are the processes pp -> {pp}sI (0) and pn -> {pp}sI (-'), with the formation of a (1)S(0) proton pair (diproton) in the final state. The measurement s of dI /d , Ay and the spin-correlation coefficients Ax,x and Ax,z will permit an amplitude analysis that should provide a non-trivial test of the I PT predictions. A combined study of these processes will lead to the isolation of the strength parameter d of the 4NI contact operator in I PT. The ANKE spectrometer is particularly well suited for the study of reactions with a final diproton. The use of the polarised COSY beams and the ANKE polarised internal target allows one to conduct single and double polarisation experiments. Preliminary results on the near-threshold measurements at ANKE of Ay in these processes are presented. The future experimental programme, including the double-polarised experiments, is discussed

Near-threshold pion production in diproton reactions at ANKE