Thanks CR001.
As suggested, we did go through the IHS page separately i.e not along with the application form.
As you said earlier correctly, the IHS came as zero for the PBS dependants, based on their visa route.
However, here also we have the option of adding the person to whom the dependants are joining. Here it is asking for that person's visa expiry date. If we enter my friend's earlier ICT visa expiry date of 29-Sep-2017, the IHS comes as zero. However, if we enter the ILR expiry date which is in 2024, the IHS came to 1400 per applicant.
Agreed, you have asked not to enter the ILR holder's details in the IHS, I may be wrong but I was bit sceptical about not being giving the details when the option is given by HO
.
Thanks again for your kind inputs.