Anyone know a good courier for sending tyres ? Will they take 4 as one parcel ?

You'll probably find it's cheaper to tape them into two-pairs and send them that way.

Interparcel will give you prices... expect to pay around £14.

Have a look at: http://www.directcouriersolutions.co.uk/

I have used these people many times and always found them to be very helpful.

They have always given excellent service.