In an earlier contribution to this discussion,
tvmo wrote:

Thanks very much for taking the time to reply.

"Not unless the current radiators are shot - which they *may* be if
the
system has been run for years without inhibitor, so that they have
rusted
inside. In this case, fitting a new boiler - which will almost
certainly use
a non-vented (pressurised) system - the extra pressure may just be the
last
straw which may cause them to start leaking. On the other hand, they
may be
perfectly ok. " - Is there a test that can be performed to check for
the integrity of the radiators/pipework?

You can pressure test the whole system with air, using something like
http://tinyurl.com/3aqgox

You would, of course, have to put temporary caps on the feed and vent pipes.

If you're removing all the radiators to give them a good flush out with a
hosepipe (very worthwhile if you're upgrading your system) it woudn't be too
difficult to devise some connections [1] which would enable you to apply
mains pressure (4 bar or so) to each rad in turn. This is well within the
design spec of the rads - but higher than the running pressure of a
non-vented system - and will quickly show up any weak spots.

[1] e.g. http://tinyurl.com/2upouw + http://tinyurl.com/2qejqo +
http://tinyurl.com/2tlc87
--
Cheers,
Roger
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