Correct Formula to Use to Populate Averages

Hi,

I can't work out what formula to use to resolve the issue below:

Populate the table to show the average base salary by country and job band in GBP. If there are no employees show a blank cell rather than a zero:

Ive attached the work book.

I thought it would be a VLOOKUP but how do you in bed an average function into that?

Any help or guidance appreciated