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The multi tool was the best tool for the job. The only other option would have been a hacksaw blade.
The screws were holding down a shed roof and it was important to remove them without damaging the wood. Unfortunately the screws had almost all been bent/hammered on the inside and neither a drill or impact driver would shift them - earlier attempts to remove by another party had ruined the screw heads.
Updates.
Grinder no use - wouldn’t fit where I need it.
DeWalt bit - lasted two screws.
Cheaper bit - lasted three screws.
Just spoke to my builder mate and he recommended a Bosch metal blade - costs around £18. The cheap bit was about £1 and the DeWalt £6 ish. You get what you pay for.
Thanks all