Kate Morgan wrote:
I sowed a packet of sunflower seeds, they have now germinated and I find
that there a number of tomato seedling`s amongst them, they are all doing
well so I will grow them on and look forward to see what grows :-)

What did you sow them in? I'm suspecting the compost rather than the packet
of seeds is the culprit. Sunflower and tomato seeds are rather different,
they'd be easy to spot!