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As far as I am aware, then no.
As I understand it, you should have received a summary of the rights and obligations, for both the service charge invoice, and for the admin charge.
If the charge is valid, you could challenge it as being unreasonable. £265 for employing solicitors to send a reminder letter
Fuck off.
Then, there's the course of dealing - You've done one thing for 10 years, and there's been no quibbling. That established it as how things are done between you.
I can check the lease, if it doesn’t specify these costs then you are saying I’m not liable for them?