Which tiles for 15 degree angle on lean to roof

[nottsrob184]

Hi all.
I'm just a normal DIY guy building a single storey rear house extension.
I am soon needing to think about tiles.
I have an angle of about 15 degrees on the lean to roof (span is 25ft length and 12 ft width.)
The existing house roof is tiled with flat tiles (built around 1969) and i wanted to keep them pretty much the same.
Anyone got any suggestions as to what i could use to satify building Cont' inspector?
Thanks

 

[datarebal]

there are a few that go to 15 degrees,though not all flat. You might look at Redland Cambrian slate..

 

[williswestcott]

If you have clay plain tiles on your roof (10.5" x 6.5" Flat) the nearest looking match you will get which goes down to 15 degrees is a Sandtoft 20/20 & we sell a lot of these for this reason.