Overseas Earning and tax in UK

[keme]

Hi I am in a bit of confusion here and I wish I could get help from good people on the forum

I worked online for a client overseas on PAYE basis while I am resident here in UK on tier 1 general visa.

My earning is paid into my foreign account and my overseas employer deduct tax at source in Ghana.

I am curious for the purpose of tier 1 general extension and later on ILR do I need to pay tax or declare this earning to tax office as it has been taxed normally by my foreign employer

I will appreciate any answers that could help me to understand this better