Following on from this, the guys laying the floor worked their way through 5 18kg tubs of the Taylor's adhesive! So over £350 on glue alone...
However, I'm not at all happy with the result and thought I should post a warning here to those who think there is such a thing as a good Internet deal on flooring! I should have gone with the slightly more expensive stuff from my local floor shop (which my mother has in her place) as it really is high quality with an even sheen of oil (they call it "eco oil"). Mine (from SEO specialists, UK flooring direct), however, was pretty blotchy where the grain was heavier than elsewhere. Also very knotty compared to samples. When I called them, they said "well, it's a natural product" and "if you read the maintenance advice, we do recommend the use of maintenance paste - eg. WOCA" and "in the instructions, it says to discard unsuitable planks". Seems to me that the natural product argument is being used to abandon quality control. Also, applying WOCA is no easy task over such a large (50sqm) area (I should have got some flooring specialists to apply it) and isn't a complete solution anyway. So I can whole-heartedly recommend spending the extra £15/sqm to get quality flooring from the Floor Shop (although I'm sure others can also do it - I think a local supplier is worth paying extra for, as the hidden costs of Internet-sourced rubbish is MUCH higher).
So if anyone can recommend a "floor doctor" to come and do something about this still blotchy floor, I'd welcome suggestions.