I need to affix some insulated plasterboard to the underside of an IG Extra Heavy Duty steel lintel:

https://iglintels.com/wp-content/upl...heavy_duty.jpg
http://www.newtonnet.co.uk/permanent/lintel.jpg

My plan was to glue and screw it in place, using Fischer UX plugs into the aerated concrete blocks above. I therefore need to drill a few 6mm holes through the lintel and was wondering how easy this will be?

The main reason I ask is that I've always found drilling metal hard work, but then all my metal drill bits are those which either came with drills or assorted bit sets. I'm sure in both cases they're the cheapest of the cheap.

Ought something like this suffice?

https://www.screwfix.com/p/bosch-str...6-x-93mm/239fv

Any other tips?