It depends completely on what sort of signal area you're in, and where you want the aerial mounted. It can work out pretty pricey, and I'd warn you that a lot of the people offering to install them have no idea what they're doing. If you're looking to save money you might be best off buying a wideband aerial; http://www.aerialshack.com/triax-unix-wideband-aerial-p-267.html and installing it yourself.
If the aerial is being replaced then add in foam filled co-ax, the old stuff has holes in the core that tend to get water in it and the weather and UV will have affected the cable over the years.
Aerial £30 ish
Lashing kit and pole £20 ish
Cable £10 ish
Labour ?
Well that depends on area, level of high ladder work and final position of cable inside house, work on a easy half day (less than 4 hours) to do a simple job, more complex = more time.
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