Yesterday while i was driving car,thanks god was very close to home,"ransfail" appeared in dash.Car was with slow speed/gear and when i was lifting my foot from acc pedal she was still keeping high revs.
Next day i tried to drive her but i realised that reverse gear was dead.
Anyway since i have to visit a workshop i am thinking to replace valve body with an upgraded one with sonnax kit
Problem is that i cannot find it in local market so wondering whether you can recommend/provide contact details of suppliers at yours so to buy/check further.

Many thanks for your assistance

I used a company called Valve Bodies UK, as recommended by RRPhil, who is the transmission expert on here. They tested and rebuilt my valve body, with the Sonnax valves, for about £200 IIRC.