Upvote:2
Normally, you would need a Visitor In Transit visa as you are changing airports and will need to pass immigration/customs.
However, you are exempt:
Transiting without a visa
You might be eligible for ‘transit without visa’ if:
- you arrive and depart by air
- have a confirmed onward flight that leaves on the day you arrive or before midnight on the day after you arrive
- have the right documents for your destination (eg a visa for that country)
One of the following must also apply:
- you’re travelling to (or on part of a reasonable journey to) Australia, Canada, New Zealand or the USA and have a valid visa for that country
- you’re travelling from (or on part of a reasonable journey from) Australia, Canada, New Zealand or the USA and have a valid visa for that country
- you’re travelling from (or on part of a reasonable journey from) Australia, Canada, New Zealand or the USA and it’s less than 6 months since you last entered that country with a valid entry visa
- you have a residence permit issued by Australia or New Zealand
- you have a common format residence permit issued by an European Economic Area (EEA) country or Switzerland
The bold exception applies to you.