The August edition of Classic Military Vehicle (CMV) has the following 'asking' prices against GMCs in the UK and local European countries:
Low £ 3,850
Average: £ 11,170
High: £ 14,500
To quote from the mag "The figures given are not valuations and not reflect condition - they have been derived from the asking price for vehicles recently advertised in CMV and on MILWEB. This is price they were advertised at, and no guarantee it was sold at this price... or that it sold at all."
The figure above can fluctuate quite sharply from month to month, but if you look back over the last 12 months, the average of the 'average' asking price has been £ 7,793, and over the last 6 months £ 7,939.