Thanks whatiswhat - recording myself is an excellent idea! Duh, why didn't I think of that!
Just to give some background and an idea of where I am at the moment: I'm not a complete beginner. I got my first bass in 1991 and devoured instruction books. However (unfortunately in my opinion) they all focused on scales and scale practice, without providing enough of the other important information (more on this later). So I became very proficient in playing the major, minor and pentatonic scales in all keys, as well as the modes, and could start from any note and play pretty much anywhere on the neck. I practiced these for months, perhaps years. However, I couldn't write basslines, transcribe songs, play with musicians or turn this scale knowledge into music, so I became frustrated and gave up.
At this point I bought a guitar and played that exclusively for 10 years. I bought fingerstyle books and got reasonably good at fingerstyle blues. As my ear opened up I became pretty good at reproducing complicated tunes and had a lot of fun.
Recently I became interested in the idea of taking up the bass again. While idly browsing online for instructional material I came across Carol Kaye's site and had a Eureka! moment. She emphasised the importance of chord tones - something I'd grown to understand through playing guitar - and actively discouraged learning scales early on. I gained more insight in an hour reading her site than I had in all of the the instructional material I'd read up to that point. (Here's the link, for anyone who's interested. Not saying it's the right way or anything, and I know she's a controversial figure, but it seems like good advice to me:
http://www.carolkaye.com/www/education/tips1.htm)
Anyway, I've since found that I can transcribe music easily, can play with others (to an extent) and can play over (under?) changes in a manner that I could only dream about first time around.
So right now I'm relying mainly on arpeggios and pentatonics, and am using chromatics and other passing tone approaches to give my lines more life. I even use occasional scale runs
What I want to do is move on from where I am - improve my rhythmic understanding and groove, while expanding my theory knowledge. I've only been playing again for six weeks but I've come on leaps and bounds. I'm hoping with a few more months 'shedding I'll be in a position to play with others on a more regular basis, so that's what I'm working towards. I'm self taught though, so I really do appreciate the advice of those who've gone before.
Sorry for the long post. I felt it might help, but now I've written it I'm not sure lol.
Thanks again, please keep the tips coming.