This should give you a better idea of exactly what you need an what everything costs and assist with your budgeting. This list is by no means exhaustive and prices vary greatly depending on persons attending and what exactly you are looking for so please do not take these figures to be accurate, only to give you a (very) rough idea.
Venue - £1,000 - £4,000
Ceremony - £300 for registrar, £500 for room hire if required
Food - £30-80 per head
Jewellery - £1,000-4,000
Clothes - varies between £400-1,000 per outfit
Wedding organiser - TBA
Wedding Decorations - TBA
Photography £1,000-2,000
Video - £500-1,000
Transport - TBA
Flowers - £500-1,500
Stationary - £300
Entertainment - For example £300 for a DJ
Hair and beauty - TBA
Wedding Cake - £300-500
Other ceremonies - eg. Mendhi - TBA
Honeymoon - £1,000-3,000
Realistically it is best to calculate everything on a spread sheet from the first instance, even a relatively small wedding will cost a lot more than you would expect.