chemo options in the uk are limited. Most oncologists here regard cc as a rare cancer and consider that chemo is ineffective - they will refer to the lack of clinical trial data.
We have seen a few oncs in the uk (my dad has cc) Prof Cunningham at the Marsden specialises in gastrointestinal cancers. You may want to consider a clinical trial - the ABC 02 trial offers gemcitabine OR gemcitabine and cisplatin, I believe they have about a 25% success rate (shrinkage of tumor and prolonging life expectancy). There is also the gemcap trial (gemcitabine and capcitabine) - I do not have any knowledge of outcomes here, there is also the XL119 trial in Leicester..
my Dad had gemcitabine and carboplatin (which is better tolerated the cisplatin) off trial which kept his disease stable however he was quite fatigued during the treatment. It also hammered his bone marrow and because his platelet levels dropped so much he is no longer able to have chemo, however he has changed his diet radically and his disease remains stable and he has a very good quality of life. I don't want to put you off chemo - what works for one does not neccessary work for another - one thing that I have learnt since my Dad was diagnosed is to ignore gloomy statistics, patients are individuals and what works for one may not work for another.