Hi PiggeryJokery,
The community feedback on this topic seems mixed - I think that's great news for you, it shows that people are happy on both platforms and either option should work out for you.
We've got a mixed Mac / PC household - I'm on a Mac, my wife on a PC, and we're both happy.
I have a personal preference for working with a Mac, but would caution that there is a learning curve to go down if you plan to switch. When I switched a few years ago, I found the learning curve not as simple as the Apple advertising suggests, and had to invest time and effort to learn the Mac way of doing things. So this could be a factor to consider. If you enjoy or at least don't mind fiddling with technology, you could have fun switching. I enjoyed the tinkering.
However if you see you laptop just as a device that just needs to do certain things, you may get frustrated learning how to do tasks in a different way and in this case it may be better to stay with PCs. My wife is in this camp - she sees her PC as a tool for doing her work - certainly not as a hobby to tinker with.
I'd also suggest you consider how intensely you work in Microsoft Office. Do you just open the odd Word document or Power Point presentation, and do basic editing? In which case, the Mac version of Microsoft Office will work fine, and you will probably even get away not even bothering to buy Microsoft Office for Mac and instead use Apple's version of Office applications, which can open and edit basic Microsoft Office documents with some limitations.
However if your work requires you to trade Powerpoint, Word, Excel documents in a corporate environment, you may run into problems with the Mac. Office for Mac is compatible with Office for Windows, but the odd flaw or gremlin sometimes creeps in - especially for Excel and Powerpoint. It the gremlin will naturally lay in wait until the super - important presentation to suddenly appear and scupper you.
i do need Microsoft Office to work perfectly on my Mac, so I use another piece of software called Parallels which allows me to run Windows on my Mac. Consequently I can use the native Windows version of Office, to ensure I get 100% compatibility when trading Office documents with PCs. You can read a review of Parallels here:
online.wsj.com/article/SB10000872396390443847404577631503443643534.html
This solution works perfectly for me, but it adds another layer or complexity to your laptop solution - not to mention cost. Again, this is great if you like fiddling with tech, but a pain if you don't.
Another consideration can be customer care. Apple will hold your hand with your new purchase via great instore customer care in the stores, whereas a PC laptop purchase via somewhere like PC World is a bit more of a box mentality - they won't want to know you once you've handed over you money and walked out with your box.
This enhanced customer care costs money though - you're going to pay more for a Mac laptop than it's PC equivalent. So if you're keen on "peace of mind" with respect to after sales support, Apple is a good bet, and if you're happy to manage your own support after purchase, you can save money via choosing a PC laptop.
Finally, seeing this is a significant purchase, a great option could be to make use of the Which? website's option for £1 daily access.
You can then see the results of their reader survey of the best laptop brands:
www.which.co.uk/technology/computing/reviews-ns/best-laptop-brands/best-laptop-brands-overview/
And also their "Best Buy" laptop recommendations:
www.which.co.uk/technology/computing/reviews/laptops/
Oh, and one last point. Microsoft have a new version of Windows coming out at the end of this month - Windows 8. If you're planning to go down the PC laptop route, hold off for a month if you can, so your new laptop comes pre-installed with Windows 8.
Good luck!