The Bahco wide jaw smooth jaw spanner was about the only one like this on the market. It opened out very wide and a short handle. S/fix number:
38428 It is £18.47
I have one of these and it is very handy indeed especially for 28mm compression joints.
I notice in a tool stall a cheap maker doing a clone for £7 to 8. Am-tech Stock Code: C1678.
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also comes with plastic jaw covers for chrome joints. The Bahco is slightly slimmer and gets in tighter. The Am-Tech has a larger adjusting wheel, so easier to adjust. I bought the Am-tech to supplement the Bahco and it is well worth the money. The Bahco is way over priced IMHO. Mine rusted on the jaws after a few days. It needs constant oiling to prevent this, as will the Am-Tech. For over £18 I would expect a chome rustproof tool.