Add most common UK cylinders

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Comprehensive list to be defined, but already reported in Google Store was:

• standard Faber steel 232bar 12 & 15 L

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12 203 232 13.9 BS 5045-7:2000 UK
http://www.divefaber.com/list/print/scuba_lpr.asp?da=11.96&a=14.5

15 203 232 16.5 BS 5045-7:2000 UK
http://www.divefaber.com/list/print/scuba_lpr.asp?da=14.5&a=22

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done in 9b430b5