On the downside 178.50 is acting as short term support and any break below will drag the pair further down till 177.75/177.
The pair’s short term resistance is around 178.90 and any indicative break above would extend gains till 179.50/180.25.
Indicators (4 Hour chart)
(50) - Sell
(14) - Buy
Recommendation: Sell GBP/JPY around 179, SL 180.25, Targets 177.75/177.