One way of cutting down on this expense is to self cater. If you are lucky enough to find a local hall that will accomodate your guest numbers then you have several options. you can hire a team of caterers to provide a buffet or you can go to sainsburies, marks and Spencer or other local supermarkets and purchase their buffet catering platters. Many halls have crockery available to hire.
Sainsburys also have a free glass hire service at many of their stores, which will go someway to providing all you need. You can then source your drinks from wherever you want and you could even use boxes of wine which can then be used to fill caraf's for the tables.
This example of a pims fountain (above) is from Michele of Tempting Propositions. and shows a great example of money saving. Rather then the real "Pimms" (alcholic beverage served with fruit and lemonade as a summer drink) which retails at approx £13.00 per bottle. michele purchased the Aldi version called "Austins" which retails at under £5.00 per bottle. this allows you to serve the sophistication with out the sophisticated cost!
Here we can see Michele and her husband cutting their "cake" which rther than the traditional wedding cake, they chose to have a cheese cake which was created for them by a friend.