Calculations for shipping (using �1 = $2 as a rough approximation):
HMRC start by working out the Import Duty. For metal ornaments, this is zero. For ceramic items, it will be in the range 3.5% to 6%
Thus duty = zero (metal) or roughly between �3 and �5 (ceramic).
Then VAT (17.5%) is calculated. This is charged on the item, on the carriage and (if appropriate) on the duty. (You pay tax on a tax!). This will work out at around �24.
There's then an �8 examination fee to be added.
So the total cost of the item, with shipping, etc will be �85 (purchase price) + �50 (carriage) + �5? (duty) + �24 (VAT) + �8 (examination fee) = �172 (or about a fiver less if it's metal).
If you bring the item back yourself:
You're allowed to bring back �145 worth of goods and souvenirs, without paying duty or VAT. So, if you don't have more than �60 worth of additional goods, you won't have to pay any charges (except possibly for excess baggage on the plane!). You could also use the green channel at the airport.
If you've already used up your �145 allowance, and the ornament is an additional import, you'll pay between �0 and �5 duty (as above), plus around �15 VAT. You'd have to use the red channel at the airport. HMRC might take the opportunity to take a cursory look through your bags but it's unlikely that they'd carry out a detailed search.
So, as long as you don't incur very high excess baggage charges, it would be better to bring the ornament back yourself.
Chris