How to manage the money in the Company in periods of inactivity ?

[dude69]

Not quite - up to the point when any retained profits have been exhausted for dividend payments, and as long as you can afford it for salary. Don't forget a director has a legal duty not to trade an insolvent company, so you have to leave sufficient working capital for the usual bills and stuff like CT and VAT payments

There wouldn't be any CT and VAT because the company would not be earning anything. Although CT liability does hangover for a long time after the income was earned (up to 21 months later).

But strictly speaking, there are no ongoing taxes other than the Companies House return every year (which costs about £20), and potentially employer's NI.