Thanks for the interesting variety of responses. However, please let me make one thing absolutely clear;
It doesn't matter to me one way or the other whether digital images made to "look" like film are allowed on this site. I just want to know what the rules are so that I don't break them or risk offending anyone.
What seems clear is that there isn't anything laid down in the laws of the site against posting such images. That said, as the majority seem to prefer that there is some analogue element used to achieve the end result, I will refrain from posting anything that doesn't originate from a scanned negative.
Aside from the shots taken at Chartwell, I think all of the images in the Flickr SEP gallery were taken on digital cameras. I never delete EXIF data, so anything that has a digital signature will show up as such. The shots scanned from negs will show that they were scanned on a Noritsu scanner (belongs to the pro at the shop who processes my film).
For anyone sufficiently interested, SEP can be used as a layer (by using opacity slider) to give a grain texture or add some black and/or a vignette into the mix on a colour shot. All I'll say is don't knock it or dismiss it until you've tried it. It can't and won't replace film but it is a lot of fun to use, in my opinion.
I am very, very familiar with how easy it is to process negs via a cupboard and changing bag as I have done it hundreds, if not thousands of times since 1974. However, I have neither the time nor inclination to do so at the moment. The few quid it costs me to have film processed for me is worth the time saved doing it - and I doubt I could do a better job. I have bought a scanner, though as I needed one for other jobs and the Epson V750 is supposed to be pretty good with film as well.
Thanks again for your responses. Paul.