I want to fit a kenward Mask unit, replace the front speakers, and fit 2 10" subs in box and amp. I don't really want to attempt it myself, and I've been given a quote of £80 to fit this. Does this sound reasonable or not? The replacement speakers will be on top of this price.

To me that sounds fair. Cabling the sub up will take around an hour, the head unit and speakers will be another hour. Assume they'll provide cable?

Yep, cables are all included. I'm going to book it in to be done then. I've waited a year to find someone to be able to do this for me. I miss the use of the cd changer. Whoops, forgot to mention the cd changer. The price will probably go up now.

It shouldn't go up much at all, as they'll have everything apart for the sub.