Does this question decide a band on its own?

No. It is one of eighteen, each counting once, and a band is the count of the ones a book leaves unanswered. The rule is set out in full here.

Is a licence number published?

A number on the operator’s own footer or listing. The Commission’s public register carries names and classes but no numbers, so this one can only be answered by the operator.

What a silence costs. Without a number there is nothing to quote in a complaint.

10answer it

3say nothing

0are not asked

Ten books answer it, and this is what with

1xBet GCSB25H4885G, one of 2 on file IV Tier Open 1xBet
22Bet GCSB23P0182X IV Tier Open 22Bet
Bangbet GCSB23Q3049C III Tier Open Bangbet
BetFox GCSB2401388B I Tier Open BetFox
betPawa GCSB26T7712J, one of 2 on file II Tier Open betPawa
Melbet GCSB25J8590V IV Tier Open Melbet
MSport GCSB26R0957A, one of 2 on file III Tier Open MSport
Premier Bet GCSB20W4367N I Tier Open Premier Bet
SportyBet 0000237 III Tier Open SportyBet
Wiwi Casino GCCA26K5423L II Tier Open Wiwi Casino

Three books say nothing at all

Betway Leaves 6 of 16 unanswered in total. III Tier Open Betway
Betwinner Leaves 11 of 18 unanswered in total. IV Tier Open Betwinner
Soccabet Leaves 6 of 18 unanswered in total. III Tier Open Soccabet

Questions this raises

What counts as an answer here?: A number on the operator’s own footer or listing. The Commission’s public register carries names and classes but no numbers, so this one can only be answered by the operator.
What does a silence cost a reader?: Without a number there is nothing to quote in a complaint.
Does this question decide a band on its own?: No. It is one of eighteen, each counting once, and a band is the count of the ones a book leaves unanswered. The rule is set out in full here.