Roof worries

[Pumpy_pants]

We bought our house 10 years ago, we are getting ready to sell.

I am increasingly concerned about the roof space and conversion which took place before we moved in.

There seems to be sag on the rear where the velux is and I'm concerned too much of the timber structure has been take away.
Please see the following photos to see why I'm concerned.

IMG_20161115_155230

• Pumpy_pants
• 15 Nov 2016

Front of house

IMG_20161115_155318

• Pumpy_pants
• 15 Nov 2016

Rear of house slight sag

IMG_20161115_155355

• Pumpy_pants
• 15 Nov 2016

Showing ridge at the rear

IMG_20161115_155455

• Pumpy_pants
• 15 Nov 2016

Internal roof space
Viewed from partition wall to semi next door to gable

IMG_20161115_155548

• Pumpy_pants
• 15 Nov 2016

Showing internal roofspace

IMG_20161115_155558

• Pumpy_pants
• 15 Nov 2016

I believe this is purlin

Any advice would be most welcome.

 

[Pumpy_pants]

Picture 1 is front of house 2 rows of tiles seem to be in/out
Picture 2 is rear next to velux.

There are no supports under the purlins to the floor, it looks like the front and rear tie into 2 beams from the ridge.

Should I be worried ?

 

[^woody^]

Should I be worried ?

Probably not unless the plaster is cracked