The following presentation shows the rules etc. as of September 2017 (by fpcc-web-editor: Following the 2019 AGM this data will need to be revised)
(by fpcc-web-editor: Following the adoption by the SCPF of 1600×1200 and the Club acquisition of the Canon SX80, the Club size is 1400×1050. This data is in need of revision).
The other week we were discussing resizing PDIs to 1024 x 768 for AV presentations on our projector & I mentioned a batch resizer by FastStone. I have put together the following step by step tutorial for using this program. It might be wise to try this with a group of copied photos to avoid any disasters. Step 8 is particularly important to avoid overwriting files.