Heat Exchangers for Boilers needed in United Kingdom

We manufacture oil boilers in the UK.

For the last few years, we have subcontracted out the main heat exchangers which form the very heart of the boiler.
We are now looking for another source of manufacture.

Is this of any interest to you, or do you know anyone with manufacturing ability to the standard required of welding a leak proof steel heat exchanger ?
we would estimate 1000 units per annum.