Advice needed: Did I mess up? Past product switch and redundancy.

LGWG

I have a capital repayment mortgage with Nationwide which I accepted in 2012, and renewed (product switch to 2 year fixed in 2015).

I was made redundant with a lump sum in the spring of 2017 and my then current mortgage deal expired in August of that year.
I carried out an online product switch with Nationwide, this time to a 5 year fixed rate.
I found new employment in December 2017 and was covering all my bills without problem through my period of unemployment (no missed or late payments etc).

Was I legally obliged to tell Nationwide that I had lost my job either at the time of being made redundant, or upon my product switch in August of that year?
I genuinely cannot recall being asked about my employment status during the online application for the product switch, indeed I cannot remember ever reading anything that stated I had to inform Nationwide about any changes in employment circumstances (unless of course if I needed something like a payment holiday). 

I've read a few similar posts suggesting there was no obligation on my part, although I'm struggling to find anything definitive. Can anyone help?

K_S

@lgwg Generally speaking, when one does a product-switch/rate-switch/product-transfer with mainstream lenders with no change in loan size or term - there are no income checks, credit-checks, underwriting, etc. So there are no questions about income nor a requirement to confirm that your circumstances are unchanged.

Afaik, a direct Nationwide rate-switch is no different and so your memory is probably correct, nothing to worry about.

Setting the issue of a product-switch aside, once you have completed on your mortgage, there is no expectation/obligation to inform the lender about changes in income, debt or commitments unless you can't make the payments and need their help to make a suitable arrangement to manage arrears, etc.