Based on the government's website the safest thing is to go through the red route, as you'll be travelling with belongings worth more than £390. If you already filled in your Tor1, then make sure you show it if asked.
How to go through customs
What to do when you arrive at customs
In most cases, you’ll be able to go through the green ‘nothing to
You must go to the red point or into the red channel to declare the
- prohibited or restricted goods
- goods for sale
- belongings or vehicles which need to be declared in order to be considered for relief from duty and tax
If you’re not sure what to do, declare your goods through the red
point or red channel.
How to declare goods if they’re travelling with
Tell the officer what goods you’ve brought with you. It may help if
you’ve a written list of the goods concerned, but the officer may
still want to question you, examine your luggage or ask you to make a
written declaration. If you have prior approval, evidence of this
should be provided.
Note that there's a separate guidance if you're travelling between the UK and EU, where the limit is £1500 instead of £390. This doesn't apply to you as you're travelling from outside the EU.