\def\isodoc@enGB{%
  \gdef\accountdatatext {Banking data}
  \gdef\accountnametext {in the name of}
  \gdef\accountnotext   {Account no.}
  \gdef\amounttext      {Amount}
  \gdef\bictext         {\scshape bic}
  \gdef\cellphonetext   {cellphone}
  \gdef\chambertext     {ch.comm.}
  \gdef\copytotext      {Copy to}
  \gdef\datetext        {Date}
  \gdef\daystext        {days}
  \gdef\descriptiontext {Description}
  \gdef\emailtext       {email} 
  \gdef\enclosurestext  {Enclosures:}
  \gdef\enclosuretext   {Enclosure:}
  \gdef\faxtext         {telefax}
  \gdef\ibantext        {\scshape iban}
  \gdef\invoicetext     {invoice}
  \gdef\oftext          {of}
  \gdef\ourreftext      {Our reference}
  \gdef\pagetext        {Page}
  \gdef\phonetext       {telephone}
  \gdef\referencetext   {Reference}
  \gdef\routingnotext   {Routing no}
  \gdef\subjecttext     {Subject:}
  \gdef\termtext        {term of payment}
  \gdef\totaltext       {Total}
  \gdef\totext          {To}
  \gdef\vatnotext       {vat no.}
  \gdef\websitetext     {website}
  \gdef\yourlettertext  {Your letter of}
  \gdef\yourreftext     {Your reference}
  \gdef\@isodate        {\ifcase\day\or
     1st\or  2nd\or  3rd\or  4th\or  5th\or
     6th\or  7th\or  8th\or  9th\or 10th\or
    11th\or 12th\or 13th\or 14th\or 15th\or
    16th\or 17th\or 18th\or 19th\or 20th\or
    21st\or 22nd\or 23rd\or 24th\or 25th\or
    26th\or 27th\or 28th\or 29th\or 30th\or
    31st\fi\space\ifcase\month\or
    January\or February\or March\or April\or May\or June\or
    July\or August\or September\or October\or November\or December\fi
    \space \number\year}
}
\def\isodoc@english{\isodoc@enGB\ClassWarning{isodoc}{language name english is obsolete: use en-GB}}