Went for a nice little trip up and around Brecon way yesterday and got carried away going through a ford and think i may have lost one possibly two fixings for the undertray under the engine of my car. Anyone know the sizes and what it is attached with ?

They are the 'through plastic-into-metal-clip' type, but if the water has torn them out you probably need to put in larger self tappers or drill and move the attachment points to a clean piece of undertray/wing liner.

Cable tie fits all.

To answer the question they are t25 (torx 25) screws