Son Born Abroad, Register as BC or Apply for Passport?

[smith1984]

I hope someone will be able to advise me.

My son, now 18 months, was born in Kazakhstan, his mother is a Kazakhstan citizen. I'm British by birth.
He is currently living here in the UK with me and has a Kazakhstan passport with a UK "Certificate of Entitlement" we received recently.

We want him to have full BC if possible and to have a UK passport, what is the best way of approaching it?
Should we apply to register him as a British citizen using form MN1? Or can we go straight ahead and apply for a passport?

I've worked my way through the passport application form and there doesn't seem to be any reason I can't just apply for that for him? As I understand it he should automatically be classed as British by descent.

Is there more than one route we could take with this?

[LilyLalilu]

If you were born in the UK your child is indeed British by descent and you can apply directly for a UK passport for him.

[ohara]

He is British by descent.

Apply straight for passport.

[smith1984]

LilyLalilu, ohara, Thanks a lot for your help, we'll do that and fingers crossed