Soho Images should do a 1 light to DV or Beta for you, however, on such a small amount of stock, what you get back might be a bit rough and ready, but if the purpose is to test your camera then it should not be too much of an issue.
Personally I prefer to use Todd AO in Camden, but that usually costs £250/hour for attended TK. I am not sure if they will process 100' either, but worth giving them a call.
I believe that NOWhere lab only do optical prints and not TK, but I might be wrong on that.