Extending fence posts

Hi guys,

I like a little diy hence why I'm here.
So to cut costs I removed old concreted in 4 × 4 8ft posts and replaced them with 8ft 10"
On hindsight I should've sourced 10ft posts for a sloping garden.
Because next door has decking I should've measured at least the distance from decking upwards to at least 6ft. Then add that to distance between decking and top of hole then add depth of hole 2ft.

Stupid me. The height from decking to top of post is 5ft 6".
I'm 6 to 10" short of where I want the height to be as the fella next door is 6ft.
In the attached photos I've replaced a section of fence. The new post on the end of that section that will start the run of new fence needs extending as well as next one. I've bought a new 7ft post and cut off 15" each end so that the perfectly flat end joins top of posts. I can then hang rails.

I'm looking for a galvanised nail plate. Possibly 100mm × 150 or 200mm.
Can anybody recommend one? Or suggest alternative? I'm not keen on extender that fits over each end as that's normally for a broken post or if you're after a really rigid fix. Also it would stand out too much.

Look forward to any help. Thanks.

https://www.toolstation.com/galvani...MIgdabgr3X6wIVGeN3Ch2deAVZEAQYAyABEgK5cfD_BwE

Bear in mind a fence is supposed to be 2M max

Thanks for your response.
Yes I realise that. That's 6ft 6"
Next door has decking so they've raised their level from a sloping garden. So wouldn't it be right that the height of the fence could be 2m from the level of their decking? Otherwise if it was from the bottom of my sloped lawn they'd be able to look over.

Also those plates from Toolstation, how come they aren't flat? What fasteners would you recommend? Thanks again

its 2m each panel from the highest post from the ground each panel needs stepping down or up so at least one end coplies with 2m from ground level

Just attached a photo which was installed last summer by contactor.
He followed slope line. Must have put in 12ft posts then cut them down.
75 inches from bottom of gravel board to top of feathered edged boards.
Cut the boards to 69 inches so 6" gravel board.
Consistent all the way down baring in mind they too had decking. Photo attached prior to boards being fitted.

Do you think I should remove the posts and install 10ft posts then I'll get the 6ft minimum from top of posts to level of their decking or for the extra 6 inches height fit the nailed plates as posted above from Toolstation?

is this a new tiered garden ?? you need the natural ground level to work from not an artificial tiered level??

Which? Neighbours?
My garden is the natural untouched.
I can use my ground to work height of fence but as my neighbours decided to add decking they have increased height advantage. Take this into account I should work out height of fence based on level of their decking?
Standing on their decking they can see over my side because they have increased the level of the natural ground.
Look at the gap between decking and natural ground. If I installed decking my side we'd probably have eye contact.

every thing is measured from the ground level this is why you are limited to 300mm before needing planning permission on decking to avoid overlooking
adding to the ground is not a new level its still the same as off when built even if 54 years ago or if newer as built

Ok so what you're saying is my posts are set at right level?
Though I won't be able to see into their garden I will see their heads if they're over 5ft 6 if they come close to the fence.
If they're over 5ft 6 and start to walk down their steps from decking i can see their heads at top of steps and they will be able to look over. This is why I want the height raised on first post. You can see the new fence I put in on the left was because as I walked down my steps they clearly saw me and I could see into her kitchen. As you climb to top of steps you're higher so if you're over 5ft 6 I'll see your head. Her boyfriend is 6ft so I will see him and he could see into my kitchen.

I'm kicking myself as an extra 6 inch height in post would give me a higher fence. As both gardens aren't level with each other. Those inches gives more privacy.

I don't think the council or the Landlord of next door can disagree. I just need positive solution to getting this fence where it needs to be. I do know now if anybody has a sloping garden install extra high posts as you can trim off the top. I think I've installed the posts pretty good.
So you would be happy with the post's height and just install the 6" gravel boards with boards cut to say 72 inches (as boards I've got are 2.4m) so it's not over 2m. So follow the slope at 78 inches from bottom of gravel board to top of boards all the way to top of garden regardless if the decking next door gives them height advantage?

Extended thank you

Finished. But didn't really have help from this site.