Received less than payslip amount

Hi, The company that was employing me went into liquidation and could not pay the final payslip. The P45/payslips still indicate the full amount, inc. PAYE deducted. I am wondering what should I actually put down in my self assessment. The P45 value or the actual amount received ? As far as tax paid as well ? The liquidation is still in progress. I am thinking to declare the tax paid as per final payslip/P45 and the net pay received as the actual amount received and providing a note explaining the circumstance that have lead to the discrepancy with received the P45. Is this the right approach? I did raise this with them but the company has closed down and don't know who to reach from there any more.

Hi,
Yes that would be the correct course of action. 
Thankyou.