Mortgaging a leasehold vs rent

Hello everyone,

I'm a bit new here but I'm after your opinion.

I've seen a nice flat for around £60000 that is leasehold but has 113 years left on the lease. I'm 23 years old and I have a 20% deposit.

So here is my question:
Would it be worthwhile mortgaging the flat then selling or renting it out when I'm married/ready to move out in roughly 8-12 years?

Or is this a bad move?

Thank you, I really appreciate the advice.