Graham wrote...
Hi, Following previous advice, the following formula returns the %
"Yes" in a range from J84:J**; ** being referenced from a value in
cell A2. Is it possible to now tweek this formula so that the first
part of the range (J84)is also remotely referenced from a value in
say B2 ? i.e. J"&B2:J"&A2 ?

=COUNTIF(INDIRECT("J84:J"&A2),"Yes")/COUNTA(INDIRECT("J84:J"&A2))*100

Yes, but there's a better way to do this.

=COUNTIF(INDEX(J:J,B2):INDEX(J:J,A2),"Yes")
/COUNTA(INDEX(J:J,B2):INDEX(J:J,A2))*100

Better still would be to restict this to the largest possible range.
If that were J1:J1000,

=COUNTIF(INDEX(J1:J1000,B2):INDEX(J1:J1000,A2),"Ye s")
/COUNTA(INDEX(J1:J1000,B2):INDEX(J1:J1000,A2))*100

Then there's shorter.

=100*PRODUCT(COUNTIF(INDEX(J1:J1000,B2):INDEX(J1:J 1000,A2),
{"Yes","<"})^{1,-1})