Rear wiper fuse rating

Apologies if this has been answered before, I've had a search and can't find anything, 

Had a dash cam fitted to the wife's 2015 Fabia a few months ago  and since then the rear wiper has stopped working, the washer works ok, looking in the manual I see it's fuse 27, looking in the fuse box I see fuse 27 is missing, so I tried fuse 22 (7.5A) for the front and rear wipers in fuse 27 position and the rear wiper works.

Question is, can anyone tell me what size fuse to use for the rear wiper please? I have found ratings according to the colour but as I said this particular fuse is missing, looking at the rest of the fuses there is nothing below 7.5A

Thanks in advance