I think that your units might have gone awry somewhere. 4 foot by 4 foot is a cupboard ;-)
Assuming that you mean 4m by 4m, then this page (dated Nov 2012) suggests between £8 to £12 per square metre, so (taking the middle of that range) giving an estimate for a fitting cost of around £160:
https://www.discountflooringdepot.co.uk/blog/2012/11/how-much-does-it-cost-to-install-laminate-flooring/
A post here (from Feb 2013) states:
"Our local laminate supplier fits for £10 a square meter. You may also need some beading for the edges if you are not fitting it under the skirting board, or a filler for the edges. You may also need strips for the doorways"
http://www.netmums.com/coffeehouse/house-garden-194/kitchen-household-14/886961-how-much-laminate-flooring-all.html
So, allowing for the 'extras', perhaps a rough budget figure of around £200 in total (plus, of course, the cost of the flooring itself) might be about right?