Pyracantha?

steveTu

The heading makes it sound like I know what I'm talking about!

The plant seems to flower every other year (or that could be because of how I'm hacking it about), then after flowering the berries slowly turn through pink to a deep red. Stunning.

Is it a pyracantha and if so any ideas on what type? The berries do look like this: https://www.rhsplants.co.uk/plants/_/pyracantha-coccinea-red-star-pbr/classid.2000033497/

...the stem is thorny to a degree.

nutcutlet

Probably, a look at the leaves would clarify

Fairygirl

From what I can see of the leaves, it certainly looks like  a Pyracantha, and right time for them to be flowering.
Difficult to determine the variety, but they all have the same requirements and care. Pretty easy to maintain.
Great plants for wildlife too. I enjoyed watching a  very fat wood pigeon eating the berries on one of mine last year 

Guernsey Donkey2

I only know Pyracantha Firethorn, it likes to lean against a wall or trellis.  It is in flower now, and has either red, yellow or orange berries later on which the blackbird and thrush enjoy in our garden. I hope this helps you Steve Tu.

steveTu

The leaves look like GD2's :

It's a stunning thing - I'm not a gardener and I think it's brilliant

Fairygirl

Definitely Pyracantha. I love them - great for boundaries, and all the little birds use mine for cover when feeding etc.
Firethorn isn't a variety, GD - it's just the common name for it.  
Yours is looking great - the bees go mad for them when they flower.
Mine are a bit behind both of yours, but they're covered in buds. I always feel it's the start of summer here when they open

1634 Racine

The flowers are vastly underrated.  As you say @Fairygirl the bees love it and if you look at the flowers up close they are exquisite 

Fairygirl

They are indeed, Racine. 
I often stand, on a warm day, and just listen to the noise of the bees on it