I'd say that was a VERY good price, though as you can see i'm based in London, thought that's not necessarily a good excuse! However, do ensure the electrician is Part 'P' qualified and a member of a domestic installer scheme as operated by the NICEIC, ECA, etc otherwise he's no better qualified to do the work than you!
Incidentally, REPLACING a light fitting, even in a kitchen is NOT notifiable; ADDING is!
Common non-compliances with down lighters are: not connecting the circuit protective conductor (cpc = 'earth') to the end of the circuit. Mounting non-fire-rated fittings in or near combustible materials, eg joists or lathe and plaster ceilings or under habitiable rooms, eg bedrooms. Specify fire-rated fittings - they only cost a few pounds extra. Also, if you're switching them via a dimmer make sure it's not overloaded. The average, low-cost dimmer switch can usually only handle around 300watts. It's not unusual to see 8 or 10 - 50 watt fittings connected to such, which will, of course burn out within months or weeks.
Sorry to bang on but we've just spent the last two days reinstall about 20 of these for the reasons mentioned and at considerably higher cost than the original (of course the guy who put them in won't return the customer's calls!)