Patch repair advice

I'm in the process of lifting up a small corridor at a local primary school. I'm replacing flotex there is a couple of small patches of screed lifted, biggest maybe 2 x 3 inches what would be the best product to patch these? Cheers

 

I use F.Ball Stopgap 400. If the holes are deep you can add aggregate and either way it sets in no time.

 

Thanks guys I just used ardex in the end worked a treat.