The tick population in Appalachia has exploded over the last ten years. Most of my walks in the woods involve getting into hundreds of larval ticks, which isn't a concern as far as disease is concerned, but the bites are still irritating.
If the statistics on juvenile/adult ticks and Lyme were accurate, I should have had it my now, having been bit hundreds of times. So far I have not suffered anything more than an itch. I don't know if it's widely available in the UK, but animal pesticides containing high percentages of Permethrin can be diluted and used to treat clothing. Unlike Deet based repellents, which ticks happily crawl over, Permethrin will kill. There is some need to be cautious with it so I won't recommend any specific usage.