Mine still getting through about a litre of coolant a week. i must sort out the leaky oil cooler. It hd 2 advisories on previous MoTs on "coolant leak from rear of engine" but strangely enough no advisories this year. I suspect dealers' MoT garages turn a blind eye for minor things.
If it gets much worse you will be in serious trouble get it sorted.
As soon as I identified ours was leaking we stopped driving it till it was fixed. Didn’t even notice loss of oil I just investigated a couple of drips found on my pit boards.
Your playing with fire if you ask me.
J