Charlie
I think it's worth a bit more than this. See if you can get a bit more out of the seller through the domain negotiation process at Sedo.
It's a reasonable domain, but what it's worth selling at depends on your circumstances. I feel a more reasonable price for this domain, where it would become "worth" selling, would be £400. It's not a generic domain though - I doubt it has much type in traffic?
Remember, you never know who the buyer is, but they could have really BIG plans, so bear this in mind with the negotiations!
All the best with the sale
accelerator