I saw of pic of a heathland online; looks like scrub brush to me. Anyway... I saw some things that I would ditch. Mind you, these suggestions are based on (1) Hiking only (not BOB), and (2) Never having been to your stomping grounds. Also, a lot are small items that won't do much to lighten your pack. My list:

Most of your cooking supplies. If you're only day-hiking, why
the dish, spork, etc? It looks like you're set to camp for a
few days. It also looks like you've got cookware, but no food
that actually needs cooking.
Coffee and tea? Pick one, or go with instant coffee. What's
with the filters?
I'd ditch the tweezers in the FAK. Scissors or the tip of a
knife, or a sewing needle work fine.
Glucose tabs in the first aid kit. Why? You're carrying dextro
tabs in the belt kit, plus sugar with your food. I'd take only
1 of those 3, as they're all just sugar.
Take either alcohol or povidine-iodine prep pads. Their use in
hospitals is virtually identical.
Do you really need a saw? I've never taken one, but you might,
since you use a hammock.
I'd try and find smaller rope/cord. Just a personal thing/
opinion.
I'd take only 1 candle.
Do you need safety and blanket pins? They're small so I don't
think this is the first thing I'd ditch.
Do you really need 50m of thread? Or is the spool only come in
that size? Again, it's a small thing to carry, so might be OK.
Buttons? Does it matter if you're showing some chest in the
woods? Use your safety pin.
I'd ditch the sharpening stone. I've gone on week-longs and not
sharpened my knife.
Sewing needles: maybe just 2 XL? Again, I'm being picky.
Vaseline. Why? Lips? Wounds? Chafing? You have antibiotic cream
and a tube of lip balm is lighter.
You've got 25 disinfectant wipes, plus your Purrell stuff in your
FAK. Take one or the other.

I realize these are all small things, and probably drop your pack only a pound or so (or a half-kilo, if you want it in metric). Again, these are my opinions. It looks to me like your pack is definetely geared towards overnight/multi-day hikes. My suggestions are thinking only about day-hiking, with the small chance of being stuck outdoors, NOT if you plan on more than one day.

Hope this helps.