Thanks for the advice and tips everyone.
I have booked in to the GP tomorrow. The lump seems to have a white head on it like a blister or pimple so I am getting it looked at. It's been a few days now and the lump is still tender. I am still feeding from it, DD doesn't seem to mind so I am hoping the GP will be able to do something.
I have read that U/Sound on the area may help too, so once I have seen the GP tomorrow I may look into that with my local Physio if I don't get anywhere with the GP.
The lump almost seems boil like???