Hi Craig,
Those pipes will have originally connected to the Webasto metering pump, which supplies diesel as required to the Webasto heater. As your car has had its Webasto removed at some point, I'd suggest that somebody has done a full job and removed all elements of the Webasto system.
The only thing that I would recommend checking is that the pipes aren't leaking Diesel - please just check that they're suitably sealed off.
Regards,
Matt.