One of the most irritating aspects of British culture is the fact that as a nation we are, it seems, constituionally unable to look over the shoulders of other nations. Many, many other nations have already introduced various forms of assisted suicide - why not gather data from them about how it has panned out for them?
Belgium, the Netherlands and Luxembourg (where I live) have all introduced assisted suicide. Switzerland has had it for some considerable time as have many other nations. The full(ish) list is:
Australia
Belgium
Canada
Colombia
Ecuador
Luxembourg
The Netherlands
New Zealand
Portugal
Spain
Switzerland
France has a slightly different take on on it: they allow physicians to place the terminally ill patient in an induced coma until natural death intervenes. I see no problem with that as the idea is to alleviate suffering if that goal is achived; the method matters little. However, it must be hell for the relatives!