Aye Up dwardo,
OK dwardo - here is my counter bug regime
As I KNOW that I am more often than not going to end up moving through and often laying up at locations with ticks I have always worn a very thin, close fitting base layer - long sleeve vest and trousers. (Previously silk, currently Helikon Tex Level 1).
I tuck the ankles into my socks (Bridgedale Trekker) and I tuck the vest into the trousers.
I always 'blouse' the ankles of my outer (working layer) trousers (usually FjallRaven Barents) over my boot tops with an internal elastic drawcord.
I've extended the waist band of the trousers and the hem(s) of my (working layer) shirts so that I don't end up with my shirt half way up my back regardless of my (work or BC) activities.
I use a pair of the thin Jack Pyke surefit shooter gloves when I'm on the move or laid up observing.
I use a bush hat if I'm going through close woodland with low hanging branches i.e. birch/hawthorn etc - consider - ticks can come from above as well as below!
I use either a head-over or a Brit mil sweat rag around my neck.
Apart from washing my hands, arms, face and neck with Incognito soap (citronella) before I go out, I try to avoid direct application of any insect repellent directly on my skin. Over the years I have found that it doesn't last long once I start to sweat.
I tend to give a quick spray of (Incognito) repellent onto my clothing at the wrists, collar, waist, ankles and over whatever head wear I'm using depending on my activity intentions. Oh yes and the fly zip area! (A mate once found a tick burrowing into his family jewels and that has put the fear of God into me ever since!
)
All my working layer clothing (inc head and hand wear) is lightly treated with permethrine and my ruck/shelter/bivy bag/maggot etc with a heavier dose.
As already stated, when I set up shelter for a protracted stay I apply the game trail and water source thought process.
After clearing the ground of debris there is a high chance of disturbing bugs so I wait a few minutes and watch before pitching a tarp/basher etc.
Since last year I've been using the incense repellent sticks (burn for about 45 mins) at brew stops and lately (since I started using a tarpee shelter) bunging one inside the shelter straight after setting it up and leaving it for about 20 minutes (towards a corner). (I used to waft a piece of smoking timber around previously).
If it warrants it (either as insulation or just for comfort) I fill one of those HD plastic emergency bivvy bags with (lots of) fern and tie off the opening really securely. This goes on top of the ground sheet and beneath the ins mat (thin ex Bundeswehr type).
Although I tend to lay out my groundsheet and insulation mat fairly soon after set up, I don't bring the GTX bivvy bag and doss bag out until I'm about to get in them.
Next day - after open-airing the latter two items I given them a good shake out, inspection, roll them back up and re-stow in my ruck.
It may seem a lot of effort to go to and there is still no guarantee that you won't get bitten - but if it is all a regular part of your routine it just becomes automatic.
You might ask - have I ever been (tick) bitten? -
Yes - sheep tick - arm pit - Northern Ireland out in the cuds - way before anyone considered the consequences and when a fag end or rubbing diesel! on them was the derigeur way of dealing with them.
Otherwise it's just been stings (my fault).
I hope that you find this useful.