METHODOLOGY

How Marchenholm measures ten UK bookmakers.

Eight pillars. Weighted to a single 0–100 index score. Every sub-measurement sourced from test accounts opened by Marchenholm Publishing Ltd from UK IP addresses and funded from its own business account.

Pillar table — weights and sub-measurements
#	Pillar	Weight	Sub-measurements
1	Odds	15%	(a) Average margin over fair odds on a 20-market Premier-League basket; (b) margin on five Cheltenham tier-1 markets; (c) margin on five tennis Grand-Slam markets. Sampled weekly.
2	Markets	12%	(a) Count of sports offered; (b) count of markets within football (Premier League + Championship); (c) count of markets within horse racing (UK + Irish day's card).
3	Live	14%	(a) Measured latency against broadcast feed on three Premier-League matches; (b) live-streaming catalogue breadth; (c) in-play market depth during a 30-minute sample.
4	Mobile	12%	(a) App Store rating (12-month average); (b) Play Store rating (12-month average); (c) crashes per 100 sessions in our test sample; (d) feature parity with desktop.
5	Payments	14%	(a) Measured withdrawal time to UK bank on five withdrawals per month; (b) count and breadth of deposit methods; (c) count and breadth of withdrawal methods.
6	Support	10%	(a) Median chat first-response across seven days of samples; (b) phone first-response; (c) email first-response; (d) resolution quality on three standard queries.
7	RG Tools	12%	(a) Deposit-limit UX accessibility; (b) loss-limit availability; (c) time-out options; (d) self-exclusion accessibility; (e) GAMSTOP linkage.
8	Security	11%	(a) 2FA availability; (b) public breach history (last 36 months); (c) KYC turnaround measured.
	Overall	100%	Weighted average of pillar scores. Reported as an integer 0–100.

RE-TEST CADENCE

Monthly, quarterly, and on trigger.

Monthly: Payments (withdrawal speed, 5 fresh tests), Support (7-day latency sample), Mobile (app stability + store ratings refresh).
Quarterly minimum: every other pillar (Odds, Markets, Live, RG Tools, Security).
On trigger: new app release → Mobile re-audit within 14 days; public breach → Security re-audit immediately.

SCORE CALCULATION

Pillar score → overall integer.

Each sub-measurement is scored 0–100 against a defined reference (e.g. "5.0% margin = 50; 3.0% = 100; 7.0% = 0"). Sub-measurements within a pillar are averaged (equal weight) to produce the pillar score. Pillar scores are weighted (see table) and summed to produce the Overall. Overall is reported as an integer.

FAQ

How we measure each pillar.

How do you measure Odds?

Average margin over fair odds on a 20-market Premier-League basket, plus five Cheltenham tier-1 markets and five tennis Grand-Slam markets. Sampled weekly. Weight: 15%.

How do you measure Markets?

Count of sports offered; count of markets within football (Premier + Championship); count of markets within horse-racing on a UK + Irish day's card. Weight: 12%.

How do you measure Live?

Measured latency against broadcast feed on three Premier-League matches; live-streaming catalogue breadth; in-play market depth during a 30-minute sample. Weight: 14%.

How do you measure Mobile?

App Store + Play Store rating (12-month average); crashes per 100 sessions in our test sample; feature parity with desktop. Weight: 12%.

How do you measure Payments?

Measured withdrawal time to UK bank on five withdrawals per month; breadth of deposit methods; breadth of withdrawal methods. Weight: 14%.

How do you measure Support?

Median chat first-response across 7 days; phone first-response; email first-response; resolution quality on three standard queries. Weight: 10%.

How do you measure RG Tools?

Deposit-limit UX accessibility; loss-limit availability; time-out options; self-exclusion accessibility; GAMSTOP linkage. Weight: 12%.

How do you measure Security?

2FA availability; public breach history (last 36 months); measured KYC turnaround. Weight: 11%.

CORRECTION POLICY

Errors corrected within 48 hours.

Errors are corrected within 48 hours of notification. The original value is preserved with a strike-through, the corrected value follows, and the correction note carries the date and the affected sub-measurement.

FIREWALL

Editorial / commercial separation.

Pillar weights are reviewed quarterly by the measurement desk.
Weights, sub-measurement definitions, and scoring curves are published in full.
Commercial agreements never reference a specific score, rank or pillar.
Operators have no pre-publication access to scores.