@drillersmum,
Being a pack-rat from way back, I had a bit of a hunt around and found my old May BIG (I keep them for a while and use old unused grids to work out my contest entries and then copy them onto the entry form), so you are in luck.
London's gateway is MARBLE ARCH; the saying is MONEY FOR old rope; and knock out (round) is ELIMINATION.
Can't say I'm really keen on Acrostics. It's mind-bending going back and forth from the clues to the grid for each letter. The clues are often also somewhat slanted I feel rather than being truly definitive, but that's just a personal gripe.
If you need any more help with it, just yell out.