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erm....

Not heard of any issues with claws penetrating the rubber to be honest, I'd be very surprised if it would happen, the rubber is quite tough, especially the thicker versions 1.52mm rather than 1.14mm. GRP would do the job great but you do have to make sure that you follow the instructions very...

The only reason to tape the joints is to create a sealed roof, no reason to do this in your case

Assuming it is plain tiles then the preferable option would be valley tiles in my opinion. As far as the differing pitch is concerned, it won't make too much difference but you should batten the lower pitch first then course round to the steeper pitch which will close the gauge (very) slightly

Sisalcraft building paper if I recall correctly, seem to have a ref 420 in my mind for some reason, I know it came in various grades (must be about 15 years since I last came across it)

I have recently come across a complicating matter as far as Building Control is concerned, now I've no idea if this is gospel but it's what our local BC told a customer. If you are re-using the old tiles even with new felt and batten it is classed as a repair and doesn't need the BC involved...

Don't like to contradict Cumbrian here but 25x50 battens would make it bloody hard to work on them giving a smaller gap to stand on whilst working up the roof, 25x38 batten is to manufacturers recommendations and to British Standard for plain tiles.

Sounds like you are looking to save some money by doing it yourself but unless you are very good at DIY you'd prob be best employing a roofer to do the work, by the time you have had scaffold erected, skips ordered etc the cost of the labour won't increase the cost by huge amounts. Plain tiles...

Best bet would be a pipe reducer 150-100mm I reckon such as http://www.ebay.co.uk/itm/Ventilation-Pipe-Reducer-Adaptor-150mm-100mm-/160781014465?pt=UK_Home_Garden_Hearing_Cooling_Air&hash=item256f4b95c1#ht_500wt_922

If it's an existing roof and you have an Android phone or I-phone it's bloody easy, download free app, rest on roof and read angle :-D

Best bet would probably be something like the Eternit Profile 6 sheet (or profile 3 if pulin centres are close enough, the pain may be getting rid of the existing asbestos cement sheets. Another option may just be to overlay the whole roof, do a search for Onduline oversheeting to see what I...

It's not the weight you've got to be aware of there as much as the pitch of the roof, at 15 degrees your choice is much reduced, the Melborne & Redland Cambrians will go to that pitch but with concrete tiles you are restricted to Marley Wessex tiles or Redland Regents really

Something like Tyvek or Permo Forte underlay

As it's just a canopy porch you can get away with type 1F bitumen felt though something more modern would be better, if you are going to do it yourself maybe speak to a local contractor who may be friendly enough to give you an offcut

The lath is fixed up the slope (90 degrees to the battens) over the boarding then the underlay fixed over this

You can do it without the boarding but for the look of the thing and the relatively minimal cost it's not worth it, if you do board it do use a counter-lath (12x38 should be fine) to allow a drape in the felt to allow any water that penetrates the tiling (not that it should) to escape

Hardrow slates are like bloody paving slabs, should come off relatively well

They look to me a bit like a Sandtoft Penine slate or similar as I can see no interlock so they are double lap slates laid with a single lap. The felt must be keeping the water out to the rest of the roof so the felt may have dropped at the top edge or is getting through a side lap of there is...

Hmm, I think you are always going to have issues there as the mortar will never create a tight seal to the GRP so allowing water to find its way through in heavy weather and wind blown rain. If the ridge line is not above the line of the back of the GRP roof there should really have been a drip...

By the sounds of it you have ridges bedded directly onto the GRP roof, is this correct?