Thank you everyone for your much needed advice.
I had settled on the idea of getting a Mono Laser for B&W, and keeping my old HP inkjet for colour.
I (my wife) had then decided to simplify things a little (and save space) by having only one printer, and so I was looking to buy a colour laser. The Brother DCP9015CDW (Catchy name, huh?) seemed a suitable candidate.
This lady in the shop just threw me a little. The figures, etc., that she produced (and I have checked them out a little, but only via t'interweb) did seem to suggest that newer Inkjets like the HP would actually work out cheaper to run than a laser, hence my quandary.
You read one article that states that lasers are far cheaper to run, but then read another that says modern inkjets are now outperforming them..
Ho hum..
The general consensus seems to tie in with my original plan, though, so thank you.
Oh, @ DrLumen - Thanks, yes, I know that the Officejet is an inkjet printer, that's why the "Pro Inkjet Lady" was recommending it, I guess.
Thanks again everyone, I guess that I should just revert to my original plan.