Ticks are spread by deer, and there are very few woods without deer passing through, particularly as deer numbers are out of control. Its the sheep tick, Ixodes Ricinus which deer carry and which spreads Lymes disease. This is a distribution chart of where its been detected in the UK, which is basically everywhere.
http://www.hpa.org.uk/Topics/InfectiousDiseases/InfectionsAZ/Ticks/TickSurveillance/tic04SurveillancemapforIxodesricinus/I put tick collars on my dogs as without them I've known them to pick up as many as 10 in a week, they can drop off them onto the sofa or carpets, and then on to us. I'd say in a couple of years we've found about 6 ticks on us, but there have probably been more we've not spotted as you can't feel them, you only see them by chance, typically on your legs or abdomen. They are best removed by spreading vaseline on them (it suffocates them), leave a few minutes, then pinch them off between the fingernails as close to the skin as possible. While they come off they make a 'tick' or click noise, perhaps where the name comes from (?). Its usually not a big deal, no worse than a midge bite.
The important thing is to know what the symptoms of Lymes disease are and if suspect, get tested and treated, in which case its not too serious. None diagnosis can be very dangerous, and while there are thousands of cases a year, general recognition of the symptoms among the public are poor- its a growing problem.
I've met / known three people who've had Lyme's, in 2 of those it was quite serious, one nearly died because it was wrongly thought to be cancer and their immune system collapsed. She told the hospital she thought she might have been bitten by 'a spider', but they dismissed it. After a few months she was tested for it by chance, but only after considerable ill health. Once diagnosed she recovered after the right antibiotics. At least one forum member -Splodger- said he's had it.
People who own woods are probably some of the best informed, its casual visitors to woods or the countryside who are most at danger as they aren't aware of the health warning signs to look for, they'd probably think they had flu or a virus and it could develop into a nasty case. I had a nasty Kidney infection last year, but the first thought that passed my mind and request to the doc was 'could it be Lymes? It wasn't.
Know the facts, then you're equipped to deal with it.