Thanks. I struggled to find that fitting locally so reinstalled the steel line from the lift pump to the filter, with a new olive. I had to bend the line slightly to make it couple up with the new pump, however, which makes me a little nervous going forwards. Is it weaker now? But so far so good on a short test drive. Not sure why I had to bend it to get it to join, perhaps the new pump is slightly different in size.
Think I'd still like to replace it with rubber line before too long, perhaps cutting the steel line if necessary, as suggested. Kinda warming up to that idea.
Much appreciated.