I have 6 years to go. No doubt the Govt. will have taken up my idea on means testing before then, and I wont be entitled as I have 47p too much in the bank. 
WFP is not means tested - millionaires like Alan Sugar are eligible. The amount you have in the bank is irrelevant, so no need to waste that 47p on a packet of Werther's Originals to get below the 'limit' .
Read the post again... Highlighted part of it for your benefit 
Not going happen in the next 6 years though. This govt will stumble no from crisis to crisis for the next 2-3 years and get the square root of eff-all done except Brexit and Band-Aid panic measures post Brexit. Then we'll be within 2 years of the next election the Conservatives aren't going to risk upsetting their core voters (the Coffin Dodgers) so triple lock, WFP, Bus Passes, TV Licenses are safe.
Also, means testing millions of pensioners - the vast majority of whom don't currently file tax self assessments because their income is all basic rate - would be very unpopular, a vote loser, and very expensive. The only workable way would be to reduce the 40% tax band starting level for pensioners to reclaim the WFP in tax. Or just roll up the WFP into the state pension - but not everyone gets the same SP coz it's based on NI years so that gets complicated too.
Limiting WFP to those who are entitled to Pension Credit would have the streets of Westminster clogged with Zimmer Frames and Mobility scooters.