Supramolecular polymers have transformed materials chemistry. Such polymers offer tremendous potential as stimuli responsive materials, due to the dynamic nature of the noncovalent interactions that hold them together; supramolecular materials exhibit properties that include self-healing, shape memory, and actuation. Moreover, supramolecular polymers have been used for a range of applications including adhesion, inkjet printing, tissue engineering and drug delivery. Temperature, pH, redox control and light have all been harnessed to regulate supramolecular polymer assembly, however, there remains a need to develop systems that are responsive to external stimuli. Foldamers could be used to achieve this; foldamers have been defined as: (i) oligomers or polymers that adopt well defined biomimetic and abiotic secondary, tertiary and quaternary structures (ii) oligomers that fold into a conformationally ordered state in solution, the structures of which are stabilized by a collection of noncovalent interactions between nonadjacent monomer units. Foldamers have been used to recognize small molecules or biomacromolecules. Regulation of foldamer function through switching is feasible where folding is driven by cooperative non-covalent interactions; several stimuli have been used to switch between unfolded and folded forms including: acid/base, cations, anions, redox state and light. Whilst single chain folded polymers have been reported, the development of self-assembled foldamers is less explored. Hydrogen bonding motifs (HBMs) have been widely used for supramolecular polymer assembly; hydrogen-bonds are reversible, directional, and, when combined into HBMs have tuneable association/disassociation affinities. A number of light responsive hydrogen-bond assembled supramolecular polymers have been described. Notably, stilbene, dithienylethene and azobenzene photoswitches have been used to regulate assembly of self-complementary hydrogen-bond assembled supramolecular polymers (i.e. AA type). In general, for ditopic ureidopyrimidinone (UPy) monomers, the concentration dependent ring-chain equilibria has been shown to bias assembly in favour of lower molecular weight cyclic oligomers for the cis or closed form whilst the trans or open form is biased towards chain extended polymers. There are few reports on visible light responsive hydrogen-bond assembled supramolecular polymers, synthons as foldamers may be considered imprecise according to the Gellman or Moore definitions -foldamers generally consist of repeating recognition units -Opie and coworkers who originally reported I described it as such, whilst in the self-assembled state, the properties of I-III all depend on the configuration (and thus conformation) of the monomer which infers interaction with non-adjacent monomers, thus we use the term selfassembled foldamer here. In each case, the cis and trans photostationary states are biased toward cyclic or extended conformations respectively and this leads to different discrete hydrogen-bonded rings and supramolecular polymer assemblies dependent on concentration and hydrogen-bond dimerization affinity.