For a basic lift to raise ride height and maintain if not slightly increase articulation (they are +2 dampers? ) that kit should do nicely, though which springs are they?
Bearmach blue springs come in 2 ranges, Heavy Duty and off road. The HD springs are stiffer making them better on road and for towing/carrying heavy loads were as the softer off road springs improve traction on rougher terrain. A case of hourses for courses.
The one potential problem with lift is that you may or may not need to sort ot the negative effect on steering geometry.
For most people +2 dampers give plenty of articulation, but if you plan on going for more articulation then you may be better of saving up for evan longer dampers and brake lines, damper mounts etc. rather than have to buy new ones again latter. You can still buy the springs now and benefit from the improve approach/break over/departure angles. In my experiance, evan with a lift on standard length dampers a Land Rover has more than enough of articulation for greenlaning and 90% of the time at pay/plays.
Procomps are a good damper for the money, though not the most robust of dampers. Its a good job they come with a lifetime garantee (keep hold of the recit), a few of people have had the break in use.
That type/style of lift kitis very common amoungst the Land Rover acessories dealers, often with slight changes like britpart springs (yellow) but the prices are very similare. Ebay might be cheaper though no garantee.