Hi Jenny Perry,
You would need to declare the income from each country separately, showing the income and tax paid (all in pounds sterling).
You can then claim a Foreign Tax Credit Relief for the foreign tax paid.
The supplementary page SA106 page F2, relates to income from overseas sources.
If there are not enought rows, you could either print of another page F2 or provide a table in the same format.
In addition to this, you may need to consider your residence status, as you were out of the UK for a long period.
You can review your residence status at:
Residence, domicile and the remittance basis: RDR1
You can take the residency tests, to help you come to a decision.
Self Assessment: Foreign (SA106)