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You do not provide sufficient information to afford a detailed answer. These are two of the main reasons why you will face a UK income tax liability:
1. Commissions are taxable in the UK under Schedule D, under either Cases I or IV. If you are a UK resident and domiciled then you are taxable on your global income.
2. You would probably be treated as an employee and the company would be under an obligation to deduct PAYE.
There are also a number of other anti-avoidance provisions that you would need to overcome to avoid tax.
If you require bespoke advice, please refer to me.
Nigel Lord
Lord Associates
Taxation & Business Consultants
Caxton House
Old Station Road
Loughton
Essex, IG10 4PE
020 8418 9101 & 07769 931852
mail@lordassociates.co.uk