Add any Uk numbers to this list
HMRC - 203 695 0120
Tech support - refund - 203 411 6925
@DnBKiwi86#181029 Tech support called back on 1646 494 9018
HMRC scam - 020 7420 8579
HMRC - 07481 072274
However, keep in mind this set of scammers keeps changing their numbers constantly to avoid call blocking.