I watched DW as a kid during the era of the Third and Fourth Doctors, carried on with less diligence during Peter Davison's tenure as Five, and gave up when Colin Baker came along as Six. I was hooked again from the very first episode I saw of the return of DW with Chris Eccleston as the Ninth Doctor, and I now love David Tennant's Ten as well. While I didn't care for Martha by the end of her run, I love Rose and Jack and adore Donna. My fic is mainly of the shippy variety, particularly - though by no means exclusively - OT3 with Rose, Jack and the Doctor. I also write friendship fic with Donna, and slash or UST-slash with the Doctor and Jack. While I can and do write the Torchwood crew as supporting characters, I'm not and never will be a Jack/Ianto or Jack/Gwen shipper. That should give you an indication of what to expect with my fic!
I'm Irish by birth and upbringing, lived for 16 years in Britain and am now living in Canada, and I'm always happy to help with Britpicking - I'll admit now that my three top peeves in fanfic are poor spelling and grammar, out-of-character writing and Americanised dialogue/cultural settings that simply don't fit. (For any authors who'd like to improve their cultural and dialogue references, I recommend the LiveJournal community dw_britglish).