From ba.com:

From Thursday 20 October a limited catering service will return on flights between London Heathrow and Spain, Portugal, Italy and Finland.

In the Euro Traveller cabin customers will be offered a sandwich and fruit pot plus a range of juices in addition to tea, coffee and bottled water.
In Club Europe, customers will be offered the same sandwich option as in Euro Traveller, but with the addition of a full bar service.