trying to sell my imac but how much would it be worth?
 

it is in flawless condition 2011 27inch imac with 16gb of ram , 1tb storage
amd radeon 6970m 2gb
and has a quad core intel i7 3.4ghz so how much would i be able to sell it for also it has apple care for 2 more years thanks for any response and could it be done in pounds

Check eBay UK to see how much a like machine is selling for. Also check any other local resellers to get an idea of street price. There's also the Mac2Sell site which gives an average selling price but may not reflect its street value.