Working week/ weekly rest

WEIR_SJ:
My simple question is…

I’ve not worked since last Friday. Agency have had no work for me this week, until tomorrow (9am) and have ask if I can work Sunday. Now I know I’m not stuck for hours at all, but if I work the Sunday can I the. Still work mon-fri next week or will I still need to take a minimum of 24 off before starting a new fixed week?

You cannot do a full 7 days in a row
This week is already a regular weekly rest
Next week can be a reduced

fixed week has nothing to do with it