Back to more serious matters: I had been planning to post this for a while, in case it is useful to other members.
After much consideration, and advice from members, I decided to buy a TomTom for the Ordinary Van, instead of ordering the factory option. I bought it before the OV arrived:
Link to satnav thread:
viewtopic.php?f=5&t=42067&start=0I needed a bracket to use the TomTom in the Mk5 and I had my eye on the document clip which I never used for documents. I made a baseplate of 1.2mm (18swg) aluminium sheet, 8" by 4" (200 by 100mm) and fixed one of the commercially available self-adhesive dash mounting discs in the centre, flush with the front edge. I found that the slightly 'brushed' finish of the sheet would not hold the suction base of the basic TomTom holder in the long term. The remainder of the sheet was sprayed matt black to prevent glare and screen reflections. Self-adhesive foam strips were affixed along the edges to provide some friction and prevent sliding.
Metric to SWG conversion:
http://www.simetric.co.uk/sigauge.htmThe result was quite satisfactory, putting the TomTom just to the side of the driver's field of vision and at a similar distance to the other instruments, avoiding the need to refocus. It was within easy reach for setting up. The wrist could be rested on top of the dash to steady the hand and minimise keying errors. The power cable dropped straight down to the 'cigar lighter' socket below, after looping round the back of the document clip.
TomTom holder in the Mk5:

The holder transferred directly to the OV as shown below. It enjoys the same advantages as above, and the power cable sneaks through into the compartment above the instrument panel where there is a convenient 12V socket.
The same holder in the Mk7:

There is another important advantage to this arrangement: the Ordinaryness is not compromised, i.e. no holes drilled, no fitting of extraOrdinary hardware, and easily removed without trace.