Table:
0
A
B
C
D
E
1
Position
Channel
Analogue terrestrial channel
Digital terrestrial channel
Internet
2
1
BBC One
1
1 50 (HD)
bbc.co.uk
3
2
ITV
3
3 33 (+1) 51 (HD)
ITV - itv.com
4
3
BBC Two
2
2
bbc.co.uk
5
4
Channel 4
4 N/A (in Wales)
4 8 (in Wales) 13 (+1) 52 (HD, not Wales)
channel4.com
6
4
S4C
N/A
4 (in Wales) 53 (HD, in Wales) N/A (rest of UK)
s4c.co.uk
7
5
Channel 5
5
5 44 (+1)
N/A
8
6
ITV3
N/A
10
itv.com
9
7
ITV2
N/A
6 27 (+1)
itv.com
10
8
E4
N/A
28 29 (+1)
e4.com
11
9
Sky Sports 1
N/A
N/A
skysports.com
12
10
Sky1
N/A
N/A
sky.com
13
11
CBeebies
N/A
71
bbc.co.uk
14
12
ITV4
N/A
24
itv.com
15
13
BBC Three
N/A
7
bbc.co.uk
16
14
Dave
N/A
12 25 (ja vu)
dave.uktv.co.uk

Questions and formulas:
Question: What is the analogue terrestrial channel when the internet shows channel4.com?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="channel4.com"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E16,E2:E16="channel4.com"),3))
Level: medium
Question: What is the position when the channel shows channel 4?
Formula: SUMIFS(A1,B1,"channel 4")
Formula2: SUMIFS(A2:A16,B2:B16,"channel 4")
Level: easy
Question: What is the channel when the analogue terrestrial channel shows n/a, and the internet is itv.com, with a position larger than 6, and digital terrestrial channel is 6 27 (+1)?
Formula: LET(query1,LET(query1,FILTER(A1:E1,(C1="n/a")*(E1="itv.com")*(D1="6 27 (+1)")),SUMMARIZE(CHOOSECOLS(query1,2),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)>6))
Formula2: LET(query1,LET(query1,FILTER(A2:E16,(C2:C16="n/a")*(E2:E16="itv.com")*(D2:D16="6 27 (+1)")),SUMMARIZE(CHOOSECOLS(query1,2),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)>6))
Level: hard
Question: What is the internet when the position is more than 13?
Formula: LET(query1,SUMMARIZE(E1,SUMX(A1)),FILTER(query1,CHOOSECOLS(query1,2)>13))
Formula2: LET(query1,SUMMARIZE(E2:E16,SUMX(A2:A16)),FILTER(query1,CHOOSECOLS(query1,2)>13))
Level: hard