Worth hedging my bets? I can only get these in time for Saturday:
https://smile.amazon.co.uk/Snow-Foa...snow+foam+lance+nilfisk&qid=1618409330&sr=8-5
https://smile.amazon.co.uk/Adjustab...snow+foam+lance+nilfisk&qid=1618409330&sr=8-9
https://smile.amazon.co.uk/Qooltek-...now+foam+lance+nilfisk&qid=1618409330&sr=8-11
Any of those will do the job, the key part is the adjustable top.