Big Cats go to Threshold worout "Have I increased my FTP?"

Hi there,

I’ve just completed ‘Big Cats’ go to Threshold workout. 3 x 8 min with 8min rest.

My last 20min power test indicated my FTP = 250.

In the above workout I averaged 283 watts for each rep eg: 113% of FTP.

I anticipate my FTP has increased. I am doing another 20min power test next week.

From the above workout is there a way / calculation of estimating my current FTP so I can pace my 20min test next week?