What is this? How did it get into my garden?

The plant shown in the attached photographs has grown within the last 3 weeks and in completely unknown to me and my friends and we have not been able to identify it locally.
It is not anything that I have planted (I think?) and I have been waiting for some form of flower so that I could be more sucsessful in finding out what it is, but it just seems to get taller without any real sign of flowering.
Any ideas on what it is and how it got here would be greatly appreciated.
Many thanks.

 

I agree with Verbascum.:gnthb:

 

Definitely Verbascum. A handsome plant, about a metre tall, yours will probably have a column of yellow flowers. It tends to self seed, hence it suddenly turning up unannounced, but is easy to control.

Chris

 

It looks like Verbascum to me.
If you don't want it then just take it out.
If you want it somewhere else (back of border) then just move it.