And also where is the best place to find a reliable engineer? I do not trust check a trade too much but where else can i find one that it can prove reliable? That is which website publishes real reviews if there is any?One of the reasons I like to do plumbing, electrics etc myself is not so much for the enjoyment and the economy but also for the destruction that some tradesman have left in my life in the past.
After saying that emboldened bit perhaps you should stay with the nupties you may get from those sites.
Pause for a moment to ponder on:-
Why are some cylinders cheaper than others?
Why do they say "you get what you pay for" ?
Why are some people so short of work that they have to resort to those web sites?