Ding repair - London

Does any know where I can get a ding repaired in London. I picked up a small ding, about 1inch square but also about 1/2inch deep last week. Naturally I need to fix it but as I live in London I'd like to get someone to do it whilst I'm here rather than wasting precious surf time when I'm next at the coast.
Looking on the web I have only so far found results for ding repair kits. I could try this but am kinda new to surfing and have never tried to do use one of these kits. Are they easy?
Looking on the web I have only so far found results for ding repair kits. I could try this but am kinda new to surfing and have never tried to do use one of these kits. Are they easy?