2011 C1/107/Aygos will be much cheaper than £5k - my 2011 C1 is worth about £1300 for a private sale, about the same as I paid for it in 2020.
A quick autotrader search shows 2011 Aygos for between £1495 (100,000 miles) and £6832 (23k miles). Median is about 3.5K for about 70K miles.That would be good as I'm planning to sell it soon - bought it to take the short trips off the Touareg but the C1 is only doing 800 miles/year so it would be cheaper to use the Touareg for the short trips and take it out for a long blast once a month.
Second hand prices are very strong right now!