Some companies will charge depending on distance or weight or combination.

I sent 4 a year or so ago with Securicor Omega Express, now DHL and cost about £30-40, that was from south-east to north-west.

The main companies i can think of are DHL, Parcel Force, City-link, Parceline and UPS.

These are nationalwide coverage, you'll have more local ones i'd guess.

Try them all for quotes.