I guess it depends on your age to some extent (altho most organisations would not admit that to be a downfall, due to 'ageist' policies becoming popular) - however, if the company are offering funding for training, i personally, would snap it up.
Regarding a claim for any benefits - it depends on the National Insurance contributions you have made in the past and for how long, and also, how much capital you will have (ie your redundancy payment).
Regarding your Tax Credits - again, it depends on whether or not your redundancy payment takes you over the 'capital' amount you are allowed to have and still claim. For example, as a single person, you can have savings of up to 10,000 (i think) without incurring any penalties on the amount of benefit you receive. But as a couple it is around 16,000. Hope this isn't confusing!!!