To wrap this up, we actually ended up ordering the following:
http://www.dell.com/uk/p/xps-15-9560-laptop/pd?oc=cnx95603%26amp;model_id=xps-15-9560-laptop
XPS 15 9560
Processor - 7th Generation Intel® Core™ i7-7700HQ Quad Core Processor (6M cache, up to 3.8 GHz)
Operating Systems - Windows 10 Home 64bit English, Dutch, French, German, Italian
Memory1 - 16GB DDR4-2400MHz; up to 32GB (additional memory sold separately)
Hard Drive - 512GB PCIe Solid State Drive
Video Card - NVIDIA® GeForce® GTX 1050 with 4GB GDDR5
Display - 15.6" FHD (1920 x 1080) InfinityEdge display
Decided the Alienware, although it had a great spec, was not right as it came with Win 10 Home and really wasn't comfortable with the design for use as a work laptop (customer facing etc)..
The Dell has a better processor and overall the package is reviewed very well..
I look forward to testing it out when we get it!
Thank you all for your invaluable help with this..