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We have carried out surface photometry and an isophotal analysis for a sampleof 25 early-type dwarf (dE and dS0) galaxies in the Virgo cluster based on CCDimages taken at the VLT with FORS1 and FORS2. For each galaxy we present $B$and $R$-band surface brightness profiles, as well as the radial colour ($B-R$)profile. We give total apparent $BR$ magnitudes, effective radii, effectivesurface brightnesses and total colour indices. The light profiles have beenfitted with S\'ersic models and the corresponding parameters are compared tothe ones for other classes of objects. The observed profiles of the brightestcluster dwarfs show significant deviations from a simple S\'ersic model,indicating that there is more inner structure than just a nucleus. In addition,we find a relation between the effective surface brightness, at a givenluminosity, and the strength of the offset of the galaxy's nucleus with respectto the center of the isophotes. Dwarfs with large nuclear offsets also tend tohave stronger isophotal twists. In sum, our findings suggest the presence ofsubstructure in most, and preferentially in the less compact, bright early-typedwarfs. The physical (dynamical) meaning of this has yet to be explored.(abridged)Comment: 29 pages, accepted for publication in A&

VLT surface photometry and isophotal analysis of early-type dwarf galaxies in the Virgo cluster