I guess I meet all the criteria mentioned by you. So, I should be okay without a transit visa then. Thanks for sharing the useful information from the authentic website @Skyler68. I truly appreciated that.Hey I got this from gov.uk.
Transiting without a visa
You might be eligible for ‘transit without visa’ if:
One of the following must also apply:
- 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)
- 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.