oil cap stuck

the oil cap on my k11 micra seems to be seized on. not urgently needed to be removed but would be nice to have it accessible. suggestions? and where can I get replacement ones? thanks :)

Just don't pull off the whole system and if cap damages, so be it :) Also on scrapy yard for just a cap, be sure to get clips and stuff and think about what you would want for your Micra before getting this cap asap
As above, get a rag around it to allow you to get a better grip on it.

Then just don't do it up as tight and it should be fine.

They do get tight.