Can you help to identify these frames, bikes or parts?

Hi there. I have recently acquired this old thing and am curious to know a little more about it. As you can see from the photos this frame has Merlin branding (Merlin Racing Cycles, Leeds on the logo) but having been in touch with Bob Jackson cycles they think they may be responsible for the paint job/ respray but they do not think it is one of their frames.

I thought it might be an Ellis Briggs (looked similar to some of their models, particularly the triangular cutouts on the forks, but they say they use 4 digit serial numbers).

There are 2 numbers- 281 and 36- stamped on the bottom bracker which Bob Jackson think may relate to the colours used.

So does anybody have any idea what it might be? The frame number appears to be 2106193- stamped on the bottom bracket.

I'm new to this road biking lark but it would be nice to know something about it.

Over to you...

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