The Trade before at 16:21:21 for 1.985p was down as a buy and the one after at 16:28:12 for 1.9834p was also down as a buy, so it being executed at 1.9918p you would assume its a buy. But the only person who really knows this is the person/institution that placed it. But I think its a buy.
At the time it executed the transaction after it time wise was at 1.7958 was reported as a buy, so it good be a buy, but the only person who knows for sure is the person that placed it.