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This is not a criticism of you per se, but you're about to spend somewhere between £700-£2500 in commission on selling your place, so approach that as you would any other purchase of a similar amount.
A good estate agent is worth the fee, a bad one won't sell your house. Ask them questions, find out their knowledge of the area and prices of equivalent properties, ask them how they intend to market the place, find out how many people they have on their books with a budget similar to the price you're wanting.
Don't go for the cheapest option, or go for the one who claims they'll sell it at a higher price, but pick the one who you think has the skills and knowledge to sell the place.
But remember that they want your business and by inflating the suggested price there's a better chance they'll choose you over their rivals.
Those that charge an upfront fee DGAF if it sells or not. Those that charge a fixed fee don't care if you end up selling for less as it doesn't affect them.
A common tactic is to woo you with a high price, get you to sign up for an exclusive period of 3 or 4 months then when it doesn't sell ring you and get you to reduce the price.
I think you need to see at least one more agent.
What's your postcode (if you don't mind sharing?)