Not true!!
You can transit with an Indian passport without a UK transit visa in some cases, please see below.
If you have a valid visa (e.g. an immigrant visa) or a PR card you can transit via UK without a transit visa for more than 24hrs, however you have to leave before midnight the next day, so in fact you may stay almost 48hrs.
Moreover, you don’t have to stay airside. You can leave the airport and rent a hotel in the city. I’ve done this myself.
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
- you have a residence permit issued by Canada issued after 28 June 2002
https://www.gov.uk/check-uk-visa/y/india/transit/somewhere_else/yes
Spread the word
P.S. Congratulations on your landing and well done.