I have a lump on my thyroid, i have had a biopsy and it came back clear, he wants to see me in 6 months time. on the same day he did the biopsy he found polyps up my nose which i have now had out, but what is the chance of this lump becoming cancerous, i

Majority are not : You have most accepted correct fallow up by your doctor, majority of thyroid nodules are not malignant , see your doctor in 6 months for revaluation, don't worry too much.

Most likely benign: Thyroid nodules are common. Over 95% of them are not cancerous. They are slow growing. As long as you follow up with your doctor, no worries.