\PARA{Acknowledgements.}

We thank Raymond Hu, Matthew Rawlings and Munindar Singh for
their comments. 
The {\scribble} project has been enriched by
an extensive dialogue with academic and industry colleagues,
including, but not limited to, Matthew Arrott, Matthew
Rawlings, Steve Ross-Talbot and Olivier Pernet.  
The first author acknowledges a fruitful 
discussion with another 
industry colleague, Antony Alappatt.  We thank all of
them, and record that this series of a dialogue between
practice and theories was made possible by the initiative
and leadership of late Robin Milner, who is also the
originator of many of the key theoretical foundations on
which {\scribble} is based.  For this reason, we
dedicate this paper to him, and hope that our work from
now on in this domain will contribute to the enrichment
of both practice and theories of computing through their
deep and honest dialogue, as Robin envisioned in his
address in Edinburgh in 1986 and encouraged us 
in the early days of this endeavour.

% The
% reported work is supported by
% EPSRC grants EP/F002114/1 and EP/G015481/1.
