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We discuss exclusive J/$\psi$ photoproduction, initially in conventional collinear factorisation at NLO and then subsequently in a refined approach with a programme of low x resummation and implementation of a crucial low $Q_0$ subtraction included. We compare and contrast predictions in both frameworks and remark about the possibility to constrain and ultimately determine the low x and low scale gluon PDF, emphasising the significance of this for future global PDF analyses.

2015 marks the 40th anniversary of Journal of Physics G: Nuclear and Particle Physics. This editorial provides a brief history of the journal, and introduces a unique collection of invited articles from leading authors to celebrate the occasion. [ABSTRACT FROM AUTHOR]