Any idea what this might be?

Petals are like in the tight bunch together. I am quite sure it´s not any wild flower.

 

I think that could be a member of the Erysimum family

 

Looks like a very weak Hesperis matrionalis...Dame's rocket.

Hesperis matronalis. - Google Search

 

The stamen and stigma look to be quite protruding in the original post @Silver surfer ??

 

True.
It is definitely in Brassicaceae.
I was trying to get a good match on the leaves...but Erysimum would fit.
Plant doesn't look very strong./healthy.
I didn't see your post I was posting similar time...finding links always adds a few mins

 

It certainly looks a bit sorry for itself

 

The plant has grown in quite dry place all summer (and it was hot in here). If weather conditions would better, it also might looks stronger).

 

@Saliha We have all got a few sorry plants after this summer and the drought some of mine are even sorrier because they are dead - phut - gone but never mind aye

 

Not sure Marley, but I think it might be agreed that it is more likely to be Erysimum because we noticed the size of the stamens & stigma what say you @Silver surfer ?

 

Tetters is right ..with the sticky out stigma it could well be Erysimum.
Agree it is not Bowles mauve.
As it is from Finland I cannot be positive, as we don't know what plants grow there that we cannot grow here /are not familiar with.
It might be a weed rather than a garden plant.

brassicaceae finland - Google Search

 

One gardener here checked those pictures and said this flower might be Iberis umbellata.

 

Sorry but I completely disagree.
What ever else it may be I do not believe it is Iberis umbellata.
They have different size petals.
2 petals are larger than others...see ...

Iberis umbellata - Wikipedia


Your top pic look to all be similar size petals....unless I am missing something.