On the downside 177 is acting as short term support and any break below will drag the pair further down till 176.45/175.75
The pair's short term resistance is around 178.25 and any indicative break above would extend gains till 178.70/179.25.
Indicators (1 Hour chart)
(50) - Buy
(14) - Sell
Recommendation: Sell GBP/JPY around 177.65 SL 178.50, Targets 176.50/175.85.