It's 4 a/c initially to be supplemented by another 4 by year end at LGW so EI will need plenty of pilots. I wouldn't be surprised if A330's are based there shortly.
The T&C's are "local market" conditions. (i.e. easyjet pay rates or similar)The terms posted above by the Italian JP person are correct. There will probably be direct entry captains also as there will almost certainly insufficent bids internally.
One advantage is that because of the seniority list you can transfer to Dublin in seniority once unfrozen. A 200 hr cadet on year 1 of the payscale in Dublin has a package of roughly €100k outside of company contributions to the defined benefit pension scheme. The basic top of scale is €206k (€250k by the time you add the gravy).
The starting salaries in Gatwick may be marginally lower than easyjet or whoever but long term it's probably a better bet. Balance sheet wise EI have almost a billion in the bank and will be around for long while yet unlike XL, flyglobespan, Aer Arann, maybe even FR.