When you "port" a mortgage, do you have to reapply?

[jampot]

We've found a house we want to buy mainly because we want to keep our current mortgage deal and if we rent we wont be able to. Dh has recently changed his job and is earning less than he was previously plus has only been doing it for 2 months - Im not working. our circumstances have changed since we applied for this mortgage and I just wondered if we had to actually reapply for it all over again or whether we would just need a new valuation on the proposed property. Any ideas?

We are in the process of purchasing a new house now that i'm on maternity pay. we have a fixed five year mortgage and we are two years in. We did have to reapply and were charged a penalty for porting but it was added to the mortgage figure. but it did reduce our mortgage by £200 a month so will be worth it in the end. Maybe you could so a self cert mortgage and not have to fully disclose what your earning?