The outside is only about 5 minutes work with WFP, but I would still charge about £10 for the outside.
The inside looks a little high to be able to do a good job using pole+ washer & squeegee.
So ideally you will need to use a ladder on the inside.
Make sure your ladder is on an anti-slip mat though.
Make sure your applicator isn't very wet and you should do no more than get a drip or 2 on the floor.
For the inside I would want about £20.
Total time for inside and out, even allowing for being very careful with a ladder on the inside should only be about 30 minutes...tops. And probably a lot quicker on repeat cleans too.
Probably about the 15 minutes or so that KJC mentioned!
A nice job if you can get it, best of luck!
Ian