NY wrote:
We have a C-shaped brick enclosure (back and two sides) which is
about 3 feet high. It was probably once used as a compost heap.

We want to enclose it by adding a fourth wall, to make a raised
flower bed. It so happens that we have some spare bricks, and can buy
any additional ones if we need them.

What is the best way of tying in the new wall to the ends of the two
side walls? Is the best way to drill holes in the existing
mortar/bricks, mortar in pegs and then lay the new bricks so the pegs
fit between the courses of new bricks in the same way that butterfly
ties are used?
https://s11.postimg.org/v5qv1gnar/enclosure.png

I'm reluctant to start chiselling-out the old mortar to make room for
proper butterfly ties, in case the mechanical shock fractures the
mortar elsewhere.
It's only a low wall (probably about 10 rows of bricks) and the only
load will be from the soil inside the enclosure. The bricks would be
standing on a concrete base, not on bare earth, so they would be
unlikely to settle over time.

http://www.ebay.co.uk/itm/Stainless-...-/172507316546

You'll need about 4, you can buy them singly at B&Q or builders
merchants....about 75p each.
Lay three courses, ties in both ends on the next course, lay another 3 or 4
courses and do the same, job done.

You'll need a drill and plugs.

Put the ties in before you start laying bricks or you'll struggle drilling

Using a starter system for this is a waste of money