It's a Wallflower (Erysimum ),Ad44downey...quite easy to take cuttings from in summer..If you cut it back to new growth after it has finished flowering,as they can get leggy,.you can use the tips for cuttings for next year...This one should also flower again next year.Mine have survived like this,for a few years..

Looks like a wallflower. Should smell nice when the sun's on it

Thank you both.

You are welcome :o)