Hello, any views here pls. After 7 yrs we managed to pay/prepay almost half mortgage on our our 2 bed flat in zone 2 London. But flat is becoming too small (2 kids) and we found a 3 bed house in zone 3, good price, need some updating, but doable, kids won’t have to change schools, still very good commute to work. I don’t feel like selling the flat now, it didn’t gain much value plus some emotional attachment… according to broker, we should be able to afford taking another mortgage and converting current one into BTL. Renting out the flat should not be a problem, idea would just to cover monthly mortgage payments on flat and tax. Current mortgage c.1700 monthly, we could rent it for 2000-2100. But I fear it’s a lots of money with 2 mortgages if something goes wrong. On another had, a new house would be perfect, bigger space. If we decide to keep the flat long term (aware of huge stamp duty) it would hopefully be a good investment, maybe leaving it for kids in the future. We are in our 40s so so also feels a new mortgage is now or it will be too late soon.