The days of reasonable priced vehicle insurance  has well and truly long gone!

Over the years, and based on volumes of vehicles on the road, the cost of vehicles, the cost to insurers in scam claims, the increase in premium due to uninsured drivers, we no longer can get what is considered value for money form our insurance companies.
And because vehicle insurance is mandatory, the insurers can charge what they like and there is not much we can do about it if we remain legal.

The best advice is to shop around.

Be factual with all the information you supply.
Price comparison sites are probably the best choice to begin with, but there are many of them and they do not all use the same insurance companies, so ensure you try a few to give the best range of quotes.

Always play around with the quotes. 
Try getting prices for fully comprehensive insurance, then try the same details but covering you for 3rd party fire and theft.
Try changing your voluntary excess to see if that makes a difference.
Try quotes with 10,000 miles per annum and then try again with 20,000 to see if that makes a difference to the price. If you under rate the mileage you do and you need to add to it part way through the year, your insurer will happily take even more money off of you.

Try adding a named driver to your policy, usually a parent (mum tends to bring back better prices)

Utilise the job description, and as long as in a round about way, the job descriptions offered covers what you do, you can use it.
For example. Someone who is a housewife (doesn't work) might get a cheaper policy to someone who is unemployed (doesn't work)

Do the insurance company offer a Black Box? If they do, find out if there are any restrictions with it. You don't want to take out an insurance policy only to find out you can't drive more than 4 independent journeys a day, or not allowed to drive after a certain time of day etc.
Try and find one with no curfews. 
Just the fact you've opted for a Black Box should bring your policy down further.
The time of the month you take the policy out can have a huge impact on the premium price.

Purchase as new a vehicle as you can, the newer the car the cheaper the insurance tends to be as it is considered less of a risk , plus it will have more modern technology on it.
Try to purchase a vehicle with an engine no larger the 1.4ltr

A car with max 5 seats will be cheaper than one with 7 or 8
Try and keep your car garaged rather than on the street, this will reduce your insurance.
Fit a recognised security system to it and use it.
Don't claim for small things such as a window chip or a small scratch, it will probably be cheaper for you to pay to get it rectified rather than end up paying additional premiums year on year after the initial payout has been made.
Don't fit mods to your car! All mods MUST be notified to your insurers. If you don't notify them of the mods and you are involved in an accident they may null and void your policy. Although spoilers, flash wheels, crazy sounding exhausts, and neon lights might be your thing, you'll pay for them in the long run.

Martin Lewis (Money expert) carried out some investigation to insurance companies a couple of years ago and found that when your renewal is due, you WILL get a cheaper price offered for your upcoming renewal price if you start enquiring for quote up to 16 weeks prior to your old policy expiring.
This is because insurance companies algorithms class you as a person who "plans ahead", a person who plans ahead for their insurance premium will also possibly plan ahead when driving on the roads, rather than someone who deals with things last minute.

Don't let these insurance companies have an easy ride of things.

Play insurance companies off against each other, if they want your business they will price match.

We all know that year on year they try to tempt you with a NO CLAIMs BONUS!!!!!
 But to be honest they are not really worth the paper they are written on, when you start ringing around for other quotes from other insurers you'll probably get a better price, and because you will have completed the year with your current insurer, your No Claims Bonus can be transferred from one insurer to the other.
Insurance companies have NO morals for customer retention and No morals for loyal customers.
The fact they have no customer satisfaction policy or benefits that thanks you for staying with them then don't worry about going elsewhere.