Two different things being talked about here. From what I understand stevo_com isn't the freeholder.
Extending a lease if you're the freeholder is just solicitors fees, there's no extension costs since you'd only be paying them to yourself. (If you share the freehold I'm assuming the other freeholders aren't going to be dicks about anything.)
Extending a lease if you're not the freeholder is the expensive bit.
Two different things being talked about here. From what I understand stevo_com isn't the freeholder.
Extending a lease if you're the freeholder is just solicitors fees, there's no extension costs since you'd only be paying them to yourself. (If you share the freehold I'm assuming the other freeholders aren't going to be dicks about anything.)
Extending a lease if you're not the freeholder is the expensive bit.