In the proposed experiments we aim to characterise the structures of aggregate species formed when divalent metal ions, such as calcium(II), interact with the anionic conjugated polyelectrolyte poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} (PBS-PFP) in D2O solution, both in the absence and presence of the non-ionic surfactant pentaethyleneglycol monododecyl ether (C12E5) using small angle neutron scattering (SANS), coupled with parallel experiments using SAXS. In addition to syudies with the norl PBS-PFP, we also intend to carry out measurements using polymers which are specifically deuterated on the backbone, which will allow us to obtain detailed information on both backbone structure and the nature of the aggregates.