I'll be bringing it back to Conlans after 1000 miles for an oil change and general check up so will ask them to cut open the filter.
I don't know why one would change oil and not the filter. Doesn't really make sense.
The new engine comes with a 2 year BMW warranty. I inquired about getting a warranty on it about a year ago and I was told that the car was too old and they wouldn't do it despite the mileage being very low.
On another note, I got the car back yesterday and she's driving like an absolute trooper. Feels much more lively now that all the carbon has been removed from ancillaries and the engine is brand new. Huge thanks to Jimmy in Conlans BMW Naas for looking after this for me and also for ensuring the car wasn't washed Very professional guy to deal with and I would highly recommend them.