I think it would be worth asking the Tiger Club nicely what their rules are and why - but my guess is that they are basically following a sensible best practice to protect themselves and their insurers.
I've never flown any of the Tiger Club aircraft sadly, but I'm open to discussion about a Taylor Monoplane
(I was however, a decade or so ago sat in all the meetings at CAA where the BMAA got permission for hiring of microlights, which is how I knew this stuff.)
Everything I know makes me believe however that you're in the clear unless anybody can prove otherwise.
G