Lester, it doesn't seem to be in anything I've seen from the PRO. The form on their file is as you describe. Everybody signed for 6 days pay. Several Account of Wages forms have been published, including three in Titanic Voices. These show a bonus, usually of 13 days, for those who returned on Lapland, but sometimes it's more. George Moore appeared at the US inquiry and didn't get back to England until Saturday, May 11. On Monday, May 13, he collected his 6 day's pay, plus a bonus for 26 days. That amounted to £5-6-8. He must have been broke before he sailed, because he obtained a £2 advance on his wages at Southampton. That was an ancient custom of the sea.
I can't find the reference just now, but somebody said the bonus was given because 'the unions squawked'. That may have been so, or it may have been a PR stunt. Whichever it was, it didn't cost White Star much.
I make Annie Caton's payout £2-10-8. What it is to be old enough to be expert with pounds, shillings and pence!