Here's a useful tip if you are using a High Street agent and you want to make sure they work for their money.
Once they've valued the property at say £200k and if you are happy with that, and once they have offered to sell for say 1.5% commission, do the following:
Propose that they receive 1% for any sale value up to £180k, then 6% of any sale price above that.
At £200k, that works out at the same commission (1% of 180k = £1800, plus 6% of 20k = £1200, total £3k commission), but it forces the agent to put his money where his mouth is and negotiate the very best price for you.
The difference that an agent makes on a sale at £180k versus £200k is very little, but it is £20k to the seller.
Note that if the agent sells at greater than £200k, he will start racking up bigger commission earned - £4200 on a sale price of £220k. But you wouldn't mind that?