P244 ORACLE 244 Fri 4 Feb ITN 2100:00           Tranmere are to double their full- time playing staff for next season in "a bold bid for promotion"N General Manager Jack Butterfield said: "It's a gamble and will extend the club's finances to the limitb.  Bobby Robson has agreed to send an England Under-21 side to Watford for Ross Jenkins' Testimonial match. The game on February 28 will help the youngsters' build-up for the European Championship matches later this year. Jenkins joined Watford 10 years ago and has played more than 350 matches, scoring well over 100 goals.