arxiv ref: 1507.06942Title: Exclusive $J/\Psi$ and $\Upsilon$ photoproduction and the low x gluonAuthors: S.P. Jones, A.D. Martin, M.G. Ryskin, T. TeubnerNode: ALU-FRUDURESRs: ESR8Work Packages: WP3: ToolsMilestones: M3.3.3 Improved PDFs using LHC data