We always use Parcel Monkey, and they seem to be the cheapest company by far..
They will do UPS, TNT, DPD and Parcelforce all of which are good choices.
If you want to drop the parcels off go for Parcelforce (Post Offices), or DPD which is just random shops like Matalan.
A quick look which a parcel weighing 2KG (1.5KG + packaging) would cost you £7.14 via DPD or £9 via parcelforce.
How much are the items worth?
We use Hermes for anything up to £50 (ish), and have 1 issue in every 250 parcels… They really aren’t that bad!
Don’t use DX – We have had many issue with them, and would always pay £2 extra to use a more reputable company
Josh