Thank you Andreas Kuhne, progress
So this {% load get_cost %}{% do_cost b.name avn avd %} was working quite
happily but for some reason is now complaining
Exception Type: TemplateSyntaxError
Exception Value:
Caught KeyError while rendering: 'avn'
Exception Location claims to be get_cost.py in do_cost, line 10 which
is avn = kwargs['avn']
but the exception is in the template line {% load get_cost %}{% do_cost
b.name avn avd %}
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