According to the Finnish Immigration Service, Indian passport holders are generally required to have a visa when transiting through Finland, unless they are eligible for an exemption.
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The American transit visa is issued for people who have to transit through the US for different purposes. This is only required for nationalities that do not come under the Visa Waiver Program (VWP), such as Indian nationals.
An airport transit visa is generally required if you travel internationally and if you need to transit through a country. Even if you do not intend to leave the airport, you may need an airport transit visa.
Indian passport holders are not obliged to hold an Airport Transit Visa. Hence, transit through Switzerland and stay at the airport international transit area is permitted without any visa. Please note that Switzerland Tourism has no authority related to granting or declining a visa.
Indian citizens don't need an airport transit visa (category A) for Poland. Whether you need one or not depends on what kind of ticket you have which you haven't mentioned in your question. If you have a single ticket (single PNR) from London to Delhi, then you don't need any other visa.
Do I need a visa? The vast majority of foreign travellers benefit from the “transit privilege” - if during a stopover at a German airport, you do not leave the International Airport Area and if the destination is not in a Schengen country, you do not need a transit visa.
An airport transit visa obliges you to remain in the international zone of the French airport. If you have to change airport or leave the international zone, you must apply for a short-stay visa. For more information on the airport transit visa (VTA), Transit passenger.