For some reason I couldn't log on properly to MN this morning before I went shopping, although I was able to read the later posts, just not post myself. So I did take your opinions on board - thank you all.
I had a look in New look and at the M and S one in the flesh as it were, and the M and S one is quite plasticky, I wasn't keen. They had some more basket weavy (raffia?) type bags in N Look and M and S, which I quite liked. I think I am going to go for more of a colourful tote in a really nice fabric, as I think she will like that, and she can fill it with stationary etc that she needs at work. Or put her things in it if she goes down to the beach for the day, or use it for all the things she has to carry around for her hobby.
Much as I adore her, I won't be spending £140 on a leather bag, I'm sure she'd love one, but she will have to drop hints to DS if she fancies a Radley bag for her birthday, its out of my price range.
Also the nature of her work is such that she definitely wouldn't take her stuff in anything really expensive, - without being too outing, she works with people who have trouble regulating their behaviour and substance intake; an expensive bag would not last long.
And of course if I get something she's not keen on, she knows I won't be offended if she wants to swap it.
I do appreciate everyone's input - many thanks