Presuming the current retail price is still £299.00 for a PMR 09 and with the secondhand market resale prices being low at the moment i would guess somewhere around the £200 mark,but saying that it just depends what somebody is prepared to pay for it but you have to consider there are lots of DM7/8's and PM8's for sale at the moment so it knocks the price down a bit more than normal.
Just remember if you list the sales price a bit on the high side you can always lower it until it sells.
Good luck with your sale