I am reading a csv file with easting and northing columns (British National Grid), however FME seems to be automatically changing them to Lat Long even though I have the projection set as EPSG:27700 or if I don't set a projection at all.

Hi @ruth_h​,

Would you mind sharing a small section of that CSV file (perhaps two or three lines, plus the header)? It would be helpful to see your workspace as well.

Check the Attribute Definition under the csv reader parameters, i suspect they are being incorrectly interpreted as time. Change the option to manual and you can then choose the type as x-coordinate and y-coordinate 

Thank you both for your replies. ebygomm - you are right, that's exactly it. It was annoying me so much but that fixes it. Thanks very much.