In MS Project, within the View tab, there is the Timescale function which opens up a drop down to allow you to choose some default timescale views (days, weeks, months etc.)

Is there a way to alter the format of these?
eg, within the 'weeks' option, the format of the bottom tier is 26/01, 02/02... etc and I'd like to change this to 26, 02... etc rather than changing it evertime.

Thanks in advance

No, there is no way to change the date formatting permanently on the Timescale bar. When you zoom in our zoom out, and return to your original level of zoom that included the custom date formatting, the date formatting will return to its default setting. Sorry, but hope this helps.

Many thanks for replying and confirming