The JVC LT-32C345 has a maximum typical contrast ratio of 1200:1. That's 76% less typical contrast ratio than a 5000:1 TV, which is the most frequently found typical contrast ratio. Across all mid-size TVs that have been on the market for a similar time to the LT-32C345 the best typical contrast ratio is 5000:1 and the worst is 1100:1.
It may also be worth also looking at one of the alternative TVs that have a 1200:1 typical contrast ratio currently available including the 32L2434 (£277.92), or the 32D3453 (£239.00) both from Toshiba or the Samsung HG32EC470 which has a better Rating.
If the typical contrast ratio of this TV is not high enough for you then you might also want to consider the 32L1343 (£224.23) (1400:1 and higher rated), the 32L1353 (1400:1 and higher rated), or the 32L3441 (£261.25) (1400:1 and higher rated) all from Toshiba.