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If option 1 got ripped off in heavy wind then you'd have much more of a problem than dust lol

you need a 25mm gap above so 75mm

Option 2 would be a complete PITA to do and wouldn't gain you anything as far as I can see

Depends which membrane you use, they can be adhered or mech fixed

Yup, the companies in the Competent roofer scheme will sort the regs issue themselves and can issue the Building Regs certificate for work done on completion including upgrading the thermal element as required.

Without insulation a slate roof will cost between £75-£100 per sqm (batten, felt, slates and labour costs) dependant on origin / quality of slate and complexity of roof

You do not need the outer layer of ply for a start so that can be discounted. You seem to be saying that you have sloping ceilings and would therefore have plasterboard, rafter, underlay, batten then tile Insulation can be placed in various positions in this instance, below the rafter and...

The felt is between the courses, I believe it is because of the rougher surface which would allow water to percolate upwards between laps They are of same quality as shingles as far as I'm aware Do a search for John Brash, they have all the info on their website

Shakes are more `rustic' and at that pitch will need an interlayer of felt between courses

Square metre rates aren't always best gauge when looking at total price, it will take as long to do that roof as one twice the size so the smaller it is the more it will be per sqm

No real difference TBH What do you mean by maximum exposure? if you mean guage, see reply above

Roll some chicken wire up and poke it under the pans of the eaves course, this blocks the access and still allows airflow, sounds a bit M-Mouse but I'm sure I've heard of this solution somewhere (think I'm not imagining it lol)

There aren't `cheap' suppliers of Cedar Shingles really, they're all around £35-£40 a bundle plus VAT but you could look at White Cedar Shingles instead You don't actually need felt or sarking with shingles, at that pitch they are laid at 95mm gauge and will lap so much you end up with 4...

You just batten as normal as far as I recall I know that one of our competitors are using hooks now on all their slate roofs (so I hear), it does make things quicker I believe. If using Brazillian slates I have been informed that it is now a recommendation to use hooks as the slate isn't as...

Something you might like to point out to your neighbour is that they could well get a fine from the council if building control weren't advised about the works, nothing to do with planning per se but BC have to be informed so they can advise re any upgrade of insulation required and BC require...

Do you mean the ridge tiles are down the slope or along the box gutter? If it's down the slope then I assume a different type of tile was used on their roof (is that an after photo or before?) and that being the case (which is perfectly normal BTW) there should be soakers your side of the...

No, that's not OSB, follow link below which shows images of OSB http://www.wickes.co.uk/sheet-materials/osb/icat/smosb/

As long as the existing roof deck is sound it is acceptable to board over the top of the existing felt but if you were quoted removal of deck it should be done or a reduction given. The minimum design fall for a roof is 1:80 but better at 1:60 so the fall you have now is a little lower than...

+1 for the inverted roof reply Basically insulation laid over the waterproofing element and retained by paving / gravel of sufficient weight to resist wind uplift

Quite normal to lay them dry first and then add mortar