Is this a weed?

Hi,
I have a bed with perrenials and for the last 2 years i've just left it to it's own devices.
This year, these have turned up.
Last year I did plant some wildflife attracting seeds in the bed and I'm thinking they are either 1 of the wildlife attracting flowers I planted which have self seeded, or they are weeds.
Can anyone help. Don't know wether to dig them up. Gonna do all my planting tomorrow, so if they are weeds I need to know asap as I can dig them up and replace with new plants.
Cheers

 

Yep, looks like Willowherb. Grows quite tall, with pretty pink flowers...that go to seed and get EVERYWHERE!

But very easy to pull up, strange for a weed, it has a very small root system.

 

Yes it looks like one to me, and it isn't the most attractive plant if it is one!

 

Looks beautiful on all the verges of the roads around here though, in the summer