Table:
0
A
B
C
D
E
1
Operator
Number purchased
Variant
Bodybuilder
Year(s) purchased
2
SHMD *
1
G6HS
Northern Counties
1952
3
Glasgow
1
D650HS
Alexander
1953
4
Cleethorpes
2
G6HS
Roe
1953, 1955
5
Swindon
4
D650HS
Park Royal
1954
6
Coventry
3
G6HS
Willowbrook
1959

Questions and formulas:
Question: Who is the operator when Roe was the bodybuilder?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Roe"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="Roe"),1))
Level: medium
Question: What is the variant when Alexander was the bodybuilder?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Alexander"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="Alexander"),3))
Level: medium
Question: Who was the bodybuilder when Coventry was operating?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Coventry"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="Coventry"),4))
Level: medium
Question: How many different variants are there for Northern Counties bodybuilder?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Northern Counties"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="Northern Counties"),3))
Level: medium
Question: Who is the operator when willowbrook was the bodybuilder?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Willowbrook"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="Willowbrook"),1))
Level: medium