I have no reason to believe Jenson are anything but Chinese re-sellers in every way.
They have history (as we say)... which dates back to a few years ago making out they were selling unique products for three times normal price on the back of some dubious marketing. They were re-branding standard e-cig kit. Yup... it's a story we've all heard before.
Will they be safe though? Well, unless they are criminals then their liquids will be registered products under the TPD.
So, there is no mystery left. Doesn't matter if they are Chinese or UK liquids. May as well vape them.
If you paid £4.99 then that's not cheap. If you paid £3 from a local shop, then you can guess the real cost of these liquids and that confirms that are imported in bulk from China.
One of the top liquid vendors ever only charges £3.50 for totally compliant UK-made products flavored with some of the very best flavors you can buy. You can also buy compliant liquid for £1.
b.t.w. they don't say "made in the UK" which is exactly what they would say if they were made in the UK - this is how these 'brand' e-cigs work.
b.t.w. also - if you didn't buy them from Jenson and they don't look like the new liquids that could make them pre-TPD. That wouldn't worry me much either.
