I have a few concerns concerns about my booking (probably down to me being tired) I have managed to book two SHORT connections.

The first one is 55 mins at Helsinki to transfer to the flight to Oslo. The second is 35 mins on return at Helsinki to get the London flight.

My thoughts are that 55 mins is enough going but 35 minutes isn't on return. Boarding normally closes 20/30 mins in advance.
The travel agency says that the airline is responsible and if you miss the connection they will sort it out. The agency said they can't change the last flight as the outgoing flight has no more business class on it (and I am taking this trip to get the 240TP I need to make BAEC Gold).

Can I make those transfers at Helsinki?

DEPARTURE

London, Heathrow (Terminal 3) - Helsinki, Helsinki Vantaa (Terminal 2)
Saturday 27 April 2019
AY1332 I 10:20 - 15:15
Business cabin

Helsinki, Helsinki Vantaa (Terminal 2) - Oslo, Gardermoen
Saturday 27 April 2019
AY915 I 16:05 - 16:35
Business cabin

RETURN
Oslo, Gardermoen - Helsinki, Helsinki Vantaa (Terminal 2)
Sunday 28 April 2019
AY912 I 08:45 - 11:05
Business cabin

Helsinki, Helsinki Vantaa (Terminal 2) - London, Heathrow (Terminal 3)
Sunday 28 April 2019
AY1343 I 11:40 - 12:50
Business cabin