Methodology
How we rate
Every casino score on Sister Sites UK is a weighted average across seven criteria. The weights below are fixed, published, and applied identically to every operator we review — commercial partner or not.
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Licensing depth (15%)
UKGC licence status verified against the Commission's public register, plus fund-protection category, ADR provider, and complaint history.
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Bonus fairness (20%)
Wagering multiplier, game contribution weightings, max bet during wagering, win caps, and clarity of terms at the point of claim.
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Game selection (15%)
Total title count across slots, live dealer, and tables, weighted by studio diversity and exclusive releases.
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Payment speed (15%)
Time from withdrawal request to funds cleared on Visa, PayPal, Apple Pay, and bank transfer, measured on real deposits.
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Mobile experience (10%)
Native app quality where offered, and mobile-web performance including load time, lobby navigation, and in-play stability.
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Customer support (15%)
Peak and off-peak live-chat response, quality of answer, and identifiability of the agent. Email fallback tested separately.
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Complaint resolution (10%)
Public complaint patterns cross-referenced with IBAS decisions and Trustpilot verified reviews within the last 12 months.
Read the full test protocol on the homepage under “How We Test”. Reviews are re-tested every 90 days at minimum.