A "fire stick" meaning a ferrocerium rod (Light My Fire or similar)? If so, you can go to flame one of two ways, you can take the spark to an ember, and treat it like you would a flint and steel fire (ember extender, bundle of dry grass or buffed up bark and blow to flame), or you can go direct to flame using plant down, birch bark scrapings or fine wood shavings. Buffed honeysuckle bark and cherry bark will also work. With the right technique you can probably go straight to flame with dry grass leaves if packed together to the right density.
Of the plant downs in the UK, I think thistle is the best, it is easy to collect large quantities quickly takes a spark readily and will burn long enough to ignite other materials. Willowherb can work, but is harder to collect enough. Cattail will certainly take the spark, but I have found that it either flashes over too fast, or self extinguishes. Found it much better for an ember extender when wadded down tight. Never had any luck with clematis down.
Have a look for Neil1's video on ferro rod use.
Chris