• accommodate, accommodation
• adviser (advisor is correct, but more common in US English)
• affect (verb – to act upon/influence), effect (noun – result)
• ageing
• alternative (another option), alternate (to take turns)
• commemorate, commemoration
• dependant (noun),
• dependent (adjective)
• ensure (make certain), insure (against risks)
• entrepreneurial
• entrepreneurship
• farther (distance), further (additional)
• focuses
• foetus, foetal
• fulfil, fulfilling
• judgment
• innocuous
• inoculate
• install, instalment, installation
• liaise, liaison
• practice (noun), practise (verb)
• programme (for example, television programme), program (only in software context)
• queuing
• rhythm
• stationary (not moving), stationery (pens and paper)

If you're not sure about the spelling of a word that isn't included on this list, contact the Style Guide.