Question: how many will a 1.8 kg turkey crown feeds?
Answer: A 4-5kg bird will serve 6-7, a 5-6kg one will do 8-10 and a 6-7kg turkey will feed 10-12. If you're catering for 6 or less, you might want to go for a crown joint rather than a whole bird – a 1.5-2kg turkey crown will serve 3-5, and a 2-2.5kg crown will feed 6-8.