I don't think your device has an SD/MicroSD card slot so it's a non-starter.... BUT...if you have, then read on:-

Sadly there's no UK Truck map, only the full Europe_Truck which we can't share download links for on this particular forum. however, see my post #10 here for maps etc [Only registered and activated users can see links. ]

Assuming you have a 4Gb SD card then you'll need either the 9.701 or 9.702 Truck navcore to run these maps from here [Only registered and activated users can see links. ]

Tutorials are all here [Only registered and activated users can see links. ]

Last but not least, if you don't have the memory but must have Truck map then buy a cheapo XL or an x20/x30/x40/x50 from eBay