So you have found the property. Now you want to proceed to the next stage. Well there are three ways in which you could go with your mortgage decisions. You could hold onto your existing property and maybe rent it out or you might be in the process of selling it. That said you might still be tied into your current mortgage and therefore have redemption fees. So the options could be;
1) Keep the property and rent it out - you will then require either a let to buy mortgage or whats called "consent to let" from your existing lender. However please note in doing this your equity will remain in the property unless there is enough to take out.
2) Sell the property and use the equity to put down on the new one and shop around for a new mortgage.
3) Sell the property and use the equity as a deposit on the new one but port your current mortgage over to the new property.