There's a way for Chancellor Reeves to catch up.  Thus far, the UK has only coughed up £12.8Bn.  Even Canada coughed up $19.7Bn Loonie.

While your chancellor is at it, conscript UK men as Mr Zelensky is challenged, to the point of kidnapping men off the street to the front.  This will be a sure help.

Godspeed;)