Travelling abroad before your citizenship ceremony, with a child who has no ceremony
A short trip before your citizenship ceremony is fine. You only become British after you attend the ceremony, so until then you remain on indefinite leave to remain (ILR) and travel on your existing (non-British) passport plus your BRP or eVisa, re-entering the UK exactly as you do now. The real issue is your son. A child registered under form MN1 does not attend a ceremony and becomes British when the application is approved and the certificate is issued, so he is already a British citizen — but his registration certificate is not a travel document, and that is what needs planning before you fly.
- You stay on ILR until your ceremony; a short trip abroad is fine and you re-enter on your existing passport plus BRP/eVisa.
- ILR only lapses after 2 continuous years outside the UK (5 years for EU Settlement Scheme settled status, 4 for Swiss citizens).
- A registered child (MN1) does not attend a ceremony — he is British once the certificate is issued.
- A registration certificate is not a valid travel document; a British child needs a British passport or a certificate of entitlement to enter the UK.
- A first child British passport costs £66.50 online and is valid for 5 years.
You (the parent): still on ILR, travel as normal
For adults, British citizenship through naturalisation (form AN) only takes effect once you attend your citizenship ceremony and make the oath and pledge. Until that day, nothing about your status has changed — you are still settled in the UK on ILR.
That means you leave and return on your current passport, with your BRP or eVisa as proof of your settled status, the same as any other trip. A few weeks in Pakistan does not put your ILR at risk. ILR only lapses if you stay outside the UK for 2 continuous years (5 years if you have settled status under the EU Settlement Scheme, 4 years for Swiss citizens). A short visit is nowhere near that.
The only timing point to watch is the ceremony itself: once the Home Office invites you, you must attend within 3 months, so don't book a long-term absence around the time your invitation is due. For a fuller view of that window, see can you travel abroad while your naturalisation application is pending.
Your son: already British, but no British passport yet
This is where premises often get confused, so it is worth being precise. Your son was registered as a child under MN1, not naturalised. The Home Office children guidance is explicit that, unlike adults, there is no legal requirement for a registered child to attend a ceremony and take the oath and pledge. He becomes British when his application is approved and the certificate of registration is issued.
So he is British in law right now. The problem is purely practical: being British and being able to prove it at an airport are two different things. The certificate of registration proves his status, but it is not a travel document. Airlines and the UK border recognise a British passport, not a paper certificate.
Returning to the UK: the two safe routes
A British citizen has the right of abode — the right to enter and live in the UK without restriction. But you have to evidence that right with a document carriers and Border Force accept. There are two ways to do this for your son:
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Get his British passport before you travel. A first child passport costs £66.50 online and is valid for 5 years. You apply with the certificate of registration. This is the cleanest option because the British passport is, by itself, full proof of right of abode.
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Travel out and back on his existing national passport while his UK immigration leave is still valid. If his previous visa or BRP/eVisa still covers re-entry, he can leave and return on the national passport as before. The alternative formal proof is a certificate of entitlement to the right of abode linked to his foreign passport, though that is a separate paid application and is rarely worth it for a single trip.
Do not let your son travel on the registration certificate alone. It proves he is British but it is not a travel document, and airlines can refuse boarding to a child who holds only a foreign passport with no British passport and no certificate of entitlement — even though he is British in law. Before you fly, either apply for his British passport, or confirm his existing national passport plus a valid UK visa/BRP/eVisa will get him back in. Leaving it to the certificate risks a refused or delayed return.
What to do before you book
Work out which route applies. If there is time before your trip, applying for his first British passport is the simplest fix and removes any doubt at the border. If you are travelling soon, check whether his existing national passport and UK immigration leave are still valid for re-entry — if both are fine, you can use them and apply for the British passport later.
Do not book non-refundable travel for your son until you are certain his return document is in hand. As GOV.UK warns, you should not rely on a passport application arriving in time. If you also want to understand the wider path to that first passport, see citizenship ceremony to first passport: the full timeline.