Same "weather shopping" policy for us. The only time I would even consider dispatching using a METAR would be if a trend of METARs over several hours significantly disproved the TAF. In that case, I'd order an EWINS TAF and compare that to all other relevant data.We have a policy against doing that. Unless you can show the Government TAF is unavailable or unreliable, we can’t get a RAMTAF..or “shop for a legal forecast”. There was a time we’d call the weather god Kavoris and he’d always give us mins for dispatch. Placed who like to use the 24 hour tempo tend to get this treatment (I’m looking at you former Soviet Union).
What do you do if the TAF amends on flight? Same same.