I will soon be needing a lintel of around 2.5-2.7m.

My engineer hasn't finished his calculations yet, so I am not sure which one
I will need exactly, but it is meant to raplace a supporting wall in a
tenement flat removed in order to create an open plan kitchen.

In the past I used a concrete one, but the memory of having to carry it 2
floors up, and then position it at nearly 4m high (height of ceiling) is not
a pleasant one. Hence I decided to investigate the possibility of using a
steel one instead.

How do they compare in terms of:

1. Weight?
2. Price? (concrete one was ~ £30 last year IIRC)
3. Availability? (I can wait a few weeks).

Thanks a lot in advance.