Hi Claire,
Asking me anything is fine with me so don't worry about it. Are you a member of any Fiesta car clubs? This way you could sell it to an enthusiast as you say, or break it for parts (cars are always worth more in parts). The problem you have is that it's been modified. Body kits are out of fashion atm so who ever buys it will obviously need to like them, or be willing to return it to standard. A few things to consider...
What's the mileage like?
How bad are the scrathes, bumps and bruises?
What condition are the alloys in?
What's it lowered on?
Interior condition?
If you're not desperate to sell the car then post it up on pistonheads and 'over price' it. I could probably help more if I saw the car
tbh, you could email me a few pics if you like?
What's the new car going to be?
Prince