Kelly, M. (2000). Identification of common benthic diatoms in rivers, Field Studies 9, pp. 583-700. [This is an introductory guide to benthic diatoms in the UK].
Cox, EJ. (1996). Identification of freshwater diatoms from live material, Chapman & Hall, London. [There is a key that covers common freshwater diatoms found in the British Isles].
There is also a five volume set of keys/photos/species descriptions by Krammer, K. and Lange-Bertalot, H. titled Süßwasserflora von Mitteleuropa: Bacillariophyceae. [These look at diatoms within middle Europe - the species descriptions are in German, however book 5 does have a key that is translated in English and French]. Follow the Springer link for these 5 books.
Sorry for the late reply Hustedt's 1930, Astrid Cleve-Euler 1951-55, from India Fresh water Algal flora of Andaman and nicobar islands Vol-1(1992),key provided by Krishnamurthy Institute of Algology (KIA-Chennai) may help you. if you don't have any problem you can send me your photographs to me I will try.