I can't help thinking that just buying cordless power tools is the best way in the long term. There are very few power tools now that aren't available battery powered. I haven't used a mains powered tool on site for ages, apart from the vacuum cleaner, and you can get quite powerful battery ones of those now.
De-walt do a battery & mains power vacuum cleaner. Its not cheap at around ÂŁ200 but its perfect for site work as it is quite powerful & runs off a 18v lithium or 230v mains.
DeWalt DCV582 18v XR Wet & Dry Vacuum - Bare Unit - https://www.mytoolshed.co.uk/dewalt-dcv582-18v-xr-wet-dry-vacuum-bare-unit.html?utm_source=google_shopping&gclid=Cj0KCQjwjN7YBRCOARIsAFCb936lYSTBALeG27q1cNLhAco8TDjusiNNyjYPAPz02YQSioZgsxdjBaMaAlRzEALw_wcB
I use it everyday so worth it to me.