Congratulations to everyone making progress, especially
Awai Ali - your many years of patience have paid off!
Here is a bit of info that I've found out, it might benefit someone (especially from the UK) in planning their trip:
Insurance
The Ontario Health insurance plan (OHIP) kicks in after 3 months of residency (other provinces are presumably similar), so I have been looking into what insurance is needed for the first 3 months.
You can buy insurance in Canada or in your current country of residence.
For buying in Canada I found the following companies who offered the 3 month insurance cover for new arrivals ("inpatriates to Canada"):
Canadasure
RSA Travel Insurance
Blue Cross
Co-operators
TIC
RBC
There may be others of course. RBC were the cheapest for our family, and RSA were the most expensive.
Those plans don't cover your flight, for which you need normal travel insurance - but "one way" since some policies only cover you if you are returning. One way is cheaper anyway!
I found a couple of policies here in the UK that cover the air travel as well as an "extension" for the 3 months health coverage needed. The company I went with is "downunder insurance" at duinsure.com (they seemed cheapest for a family). They do 11% cashback if you book via "Quidco" too.
Flights
The cheapest direct flights to Toronto from the UK for most dates seem to be Air Transat, via "Canadian Affair". From £222 from Manchester early in July. They also fly cheaply from Gatwick. For some dates further in the future it seems to be better to fly Air Iceland and stop-over for a night in Reykjavik!
The BA flights are cheaper via travel agents than going direct.
Shipping
In most cases it is cheaper to sell your stuff and buy out there, but if you have a lot of stuff and need to ship goods then the shipping companies seem to enjoy charging too much money for insurance. Letton Percival offer an independent marine policy that is cheaper and still covers everything.