Based on the following site £10 in 1972 was worth £99 in 2010 based on RPI. Adding on inflation of just over 5% for 2011 I think the value would now be around £105
http://safalra.com/ot...ion-price-conversion/
Unfortunately I'm not sure whether that table is based on January of each year or December of each year.
So I'm not sure which is right, although as RPI was quite high in 1972, I think the December 72 to December 2011 figure is more likely to be around 102. Again that doesn't help, but I do think £108 seems a little too high