What happens when a long residential leaseholder's lease runs out if they also have a share of the freehold? I suppose it just means they have a vote in whether to grant a new long lease to themself? Is it better to extend the existing lease or wait till it expires since you've got a share of freehold?
With "a share of the freehold" you presumably mean that a management company formed for the purpose holds the freehold and that you have a share in the management company. It is normal for the management company to issue 99 year leases to the shareholders and when this drops to 70 years to issue new 99 year leases.
It only costs the price of a soliciotor - say �500 in London. Ideally just do it once, before expiry, creating a lease of 999 years - and never worry about it again.