thats taking the pi** no wounder it was £160, wait till you get a leek in your roof and see if your roofers come out and fix it.
Pay cheap pay twice as you said, the prices you put up for labour sound fine to me, I dont think any one is ripping you off with the prices.
Solar dins are not the best inverters ever made but should let you have some fun.
Good luck, hope you dont electrocute yoruself.
Jonathan



What am I reading here
There will be no leak in the roof as I designed the system
I take it you meen SOLADIN have fun?
Having been an Electrical Eng for 50 years and having run my own company one does not REQUIRE luck.
George