"in " instead of "in: " before book title for incollection (oxford style)

Thank you, Jesse, Peter and Jens for your help with my previous queries. 
That's all working very nicely now.

A remaining niggle: I seem unable to change the separator before the book 
title for incollection items. With my jurabib options, it comes out as 
"in: ", and I would like just "in ". I have done a lot of poking around 
but nothing I have tried seems to work. For example, I expected
   \renewcommand{\bibbtsep}{in }
to do what I want, but no, it still comes out as "in: " in the citation 
and bibliography. I also tried \def\incollinname{in }.

Any suggestions?

Complete minimal example doc below.

Many thanks,

Seb

===============

\documentclass{report}

\usepackage[
     authorformat=abbrv,%
     authorformat=reducedifibidem,%
     citefull=chapter,%
     commabeforerest,%
     titleformat=all,%
     ibidem=strict,%
     oxford,%
     pages={format,always},%
     bibformat=ibidem,%
     see=true,% 
]{jurabib}

\renewcommand{\bibbtsep}{in }  % doesn't work; still get `in: '

\begin{document}
\chapter{First Chapter}

Hello.\footcite{Osgerby1995from}

\newpage
\bibliography{jtest} 
\bibliographystyle{jox}

\end{document}

======

jtest.bib:

@INCOLLECTION{Osgerby1995from,
   author = {Osgerby, Bill},
   title = {From the roaring twenties to the swinging sixties: continuity and change in {B}ritish youth culture, 1929-1959},
   booktitle = {What difference did the war make?},
   publisher = {Leicester University Press},
   year = {1995},
   editor = {Brivati, Brian and Jones, Harriet},
   address = {Leicester},
   edition = {Pbk.},
}

============



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