Total travel time to LHR is 15:05h.

HEL to LHR is an Airbus A320. 2h flight.

Nonstop flights are 13:05h to 13:15h.

For a connecting flight thats not too bad?

There is always a price for a cheap flight (2h of your time).

HEL/LHR seems to be 3 hours whenever I look at it.

But total travel time with Finnair is indeed usually quite low because they shave the connection time to the bone. No other airline I know of would dream of allowing only 45 minutes for an onward connection through a hub. And the downside of short connection times is the possibility of delayed luggage, as others have mentioned.

Instead of running through an airport I would rather spend a couple of peaceful hours in a nice lounge, with a relaxing shower and some decent food and drink, and wifi that works etc. Still, each to his own.

45 minutes is tight, but Helsinki is rather a small airport so making the connection never seemed a problem when I last used Finnair.

Connecting was very tight...

In flight entertainment was lousy, food was dire and the average age of the cabin crew was 56 !! Cheap ticket though

Flew with the ma while back 3/4 star airline I would say. Staff were a little abrupt, food lacked options, that's all.