OK. So on a TG order of £193.32 (including £9.69 postage), I've just been advised that the import charges are as follows:
NOTE: the total value used for calculation of all Duty-based fees is 0.00.
Government Charges: 47.09
Brokerage Charges: 11.50
Freight Charges: 0.00
VAT: 0.00
Given UPS haven't filled in the VAT total and have zero-rated the duty, I would still hazard a guess that the £47.09 includes VAT and duty. The UPS handling charge is £11.50, on par with what Parcelforce tend charge on import.
I honestly think this is pretty much on par with what was expected, as I was looking at about £40 in VAT and under £10 on duty (despite what the UPS receipt says). The handling fee is ridiculous, but I've been paying that on imports from the US for years, so again was expected.
Overall, it is probably marginal in terms of whether any additional costs have been incurred. If you meet the minimum spend, it seems about the same, and still cheaper for me than getting the kit/RIF in the UK.