Taxation on per diems

Hello,

My company had sent me to UK for a short-term assignment. From the per-diems amount, I saved around 1.2 Lacs which was credited to my salary account after coming back to India. But, In Form 16, this amount is not considered for tax calculation.

I read from some personal finance sites, that this amount is taxable.

1. Are these savings taxable? If yes, Is it taxable as per my slab or any other rates?

2. In the ITR form, which section should I add this in income? Because, this is not shown in Form 16.

Thank you.