ted-paper, you might be lucky.
If this is the only split, go to Halfords or another motor store and buy a length of clear plastic window washer tubing and 2 push-in plastic connectors.
Snip the old pipe at either end of the split. Warm the end of the old pipe with hot water or a hair dryer and insert a plastic connector into each end of the cut pipe.
Cut a piece of the new tubing to a suitable length and repeating the warming trick, push it onto each of the plastic connectors - job done, Total time 10 minutes, total cost about a tenner.
To prevent this happening again, use good quality windscreen washer concentrate in the washer bottle, diluted as per instructions, to prevent the pipe freezing in cold weather which is a likely cause of the problem.
Before cutting the old pipe, get the motor factor guys to check that they have the correct diameter tubing and connectors - there are at least two different kinds.
To avoid losing the the cut ends of the old pipe into the body-work / trim, tie a bit of string around them or tape them in place.